(Isaiah 4:1)
And in that day seven women shall take hold of one man, saying, We will eat our own bread, and wear our own apparel: only let us be called by thy name, to take away our reproach.

This is the consequence of the lack of men from the war threatened in chapter 3: a lack of men
This is a 7:1 ratio of women to men, making them so desperate to have children they are willing to do it without marriage.

REPROACH, v.t. [L. prox, in proximus.]

To censure in terms of opprobrium or contempt.
Mezentius with his ardor warm'd his fainting friends, reproach'd their shameful flight, repell'd the victors.
To charge with a fault in severe language.
That shame there sit not, and reproach us as unclean.
To upbraid; to suggest blame for any thing. A man's conscience will reproach him for a criminal, mean or unworthy action.
To treat with scorn or contempt. Luke 6.

REPROACH, n.

Censure mingled with contempt or derision; contumelious or opprobrious language towards any person; abusive reflections; as foul-mouthed reproach.
Shame; infamy; disgrace.
Give not thine heritage to reproach. Joel 2. Isa 4.
Object of contempt, scorn or derision.
Come, and let us build up the wall of Jerusalem, that we may be no more a reproach. Neh 2.
That which is the cause of shame or disgrace. Gen 30.

(Isaiah 3:25)
Thy men shall fall by the sword, and thy mighty in the war.

TAKING AWAY REPROACH

(Genesis 30:23)
And she conceived, and bare a son; and said, God hath taken away my reproach:

(Psalms 119:39)
Turn away my reproach which I fear: for thy judgments are good.

(Luke 1:24)
And after those days his wife Elisabeth conceived, and hid herself five months, saying, Thus hath the Lord dealt with me in the days wherein he looked on me, to take away my reproach among men.

(Isaiah 4:2-3)
In that day shall the branch of the LORD be beautiful and glorious, and the fruit of the earth shall be excellent and comely for them that are escaped of Israel. And it shall come to pass, that he that is left in Zion, and he that remaineth in Jerusalem, shall be called holy, even every one that is written among the living in Jerusalem:

This is obviously the Millennial Kingdom and the Reign of Jesus Christ on the earth
Israel here is the branch, Jesus being the Vine

(Isaiah 11:1)
And there shall come forth a rod out of the stem of Jesse, and a Branch shall grow out of his roots:

(John 15:2)
Every branch in me that beareth not fruit he taketh away: and every branch that beareth fruit, he purgeth it, that it may bring forth more fruit.

(John 15:4)
Abide in me, and I in you. As the branch cannot bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in me.

(John 15:5)
I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing.

(John 15:6)
If a man abide not in me, he is cast forth as a branch, and is withered; and men gather them, and cast them into the fire, and they are burned.

(Isaiah 4:4)
When the Lord shall have washed away the filth of the daughters of Zion, and shall have purged the blood of Jerusalem from the midst thereof by the spirit of judgment, and by the spirit of burning.

When there is no repentance from sin, then there must be judgment
THE LORD alone purges sin
The sins were bloody, murderous
This was the women (daughters)
as well as the men
The spiritual meaning is intense-filth, washing, blood, purging, fire, judgment, sin
The word "filth" in various forms is used 35 times in Scripture, all of which refer to man himself, his behaviour, his cities, his mouth, his clothing, his money, etc.
In all instances it needs washing

FILTH

FILTHINESS OF ISRAEL

(2 Chronicles 29:5)
And said unto them, Hear me, ye Levites, sanctify now yourselves, and sanctify the house of the LORD God of your fathers, and carry forth the filthiness out of the holy place.

(Isaiah 28:8)
For all tables are full of vomit and filthiness, so that there is no place clean.

(Lamentations 1:9)
Her filthiness is in her skirts; she remembereth not her last end; therefore she came down wonderfully: she had no comforter. O LORD, behold my affliction: for the enemy hath magnified himself.

(Ezekiel 16:36)
Thus saith the Lord GOD; Because thy filthiness was poured out, and thy nakedness discovered through thy whoredoms with thy lovers, and with all the idols of thy abominations, and by the blood of thy children, which thou didst give unto them;

(Ezekiel 22:15)
And I will scatter thee among the heathen, and disperse thee in the countries, and will consume thy filthiness out of thee.

(Ezekiel 24:11)
Then set it empty upon the coals thereof, that the brass of it may be hot, and may burn, and that the filthiness of it may be molten in it, that the scum of it may be consumed.

(Ezekiel 24:13)
In thy filthiness is lewdness: because I have purged thee, and thou wast not purged, thou shalt not be purged from thy filthiness any more, till I have caused my fury to rest upon thee.

(Ezekiel 36:25)
Then will I sprinkle clean water upon you, and ye shall be clean: from all your filthiness, and from all your idols, will I cleanse you.

(Zephaniah 3:1)
Woe to her that is filthy and polluted, to the oppressing city!

(Zechariah 3:3)
Now Joshua was clothed with filthy garments, and stood before the angel.

(Zechariah 3:4)
And he answered and spake unto those that stood before him, saying, Take away the filthy garments from him. And unto him he said, Behold, I have caused thine iniquity to pass from thee, and I will clothe thee with change of raiment.

FILTHINESS OF THE HEATHEN

(Ezra 6:21)
And the children of Israel, which were come again out of captivity, and all such as had separated themselves unto them from the filthiness of the heathen of the land, to seek the LORD God of Israel, did eat,

(Ezra 9:11)
Which thou hast commanded by thy servants the prophets, saying, The land, unto which ye go to possess it, is an unclean land with the filthiness of the people of the lands, with their abominations, which have filled it from one end to another with their uncleanness.

(2 Peter 2:7)
And delivered just Lot, vexed with the filthy conversation of the wicked:

NINEVEH, ASSYRIA

(Nahum 3:6)
And I will cast abominable filth upon thee, and make thee vile, and will set thee as a gazingstock.

ALL OF MANKIND

(Job 15:16)
How much more abominable and filthy is man, which drinketh iniquity like water?

(Psalms 14:3)
They are all gone aside, they are all together become filthy: there is none that doeth good, no, not one.

(Psalms 53:3)
Every one of them is gone back: they are altogether become filthy; there is none that doeth good, no, not one.

(Proverbs 30:12)
There is a generation that are pure in their own eyes, and yet is not washed from their filthiness.

(Isaiah 64:6)
But we are all as an unclean thing, and all our righteousnesses are as filthy rags; and we all do fade as a leaf; and our iniquities, like the wind, have taken us away.

(Revelation 22:11)
He that is unjust, let him be unjust still: and he which is filthy, let him be filthy still: and he that is righteous, let him be righteous still: and he that is holy, let him be holy still.

THE CHURCH

(1 Corinthians 4:13)
Being defamed, we intreat: we are made as the filth of the world, and are the offscouring of all things unto this day.

(2 Corinthians 7:1)
Having therefore these promises, dearly beloved, let us cleanse ourselves from all filthiness of the flesh and spirit, perfecting holiness in the fear of God.

(James 1:21)
Wherefore lay apart all filthiness and superfluity of naughtiness, and receive with meekness the engrafted word, which is able to save your souls.

(1 Peter 3:21)
The like figure whereunto even baptism doth also now save us (not the putting away of the filth of the flesh, but the answer of a good conscience toward God,)
by the resurrection of Jesus Christ:

FALSE TEACHERS IN THE CHURCH

(Jude 1:8)
Likewise also these filthy dreamers defile the flesh, despise dominion, and speak evil of dignities.

THE MOUTH

(Ephesians 5:4)
Neither filthiness, nor foolish talking, nor jesting, which are not convenient: but rather giving of thanks.

(Colossians 3:8)
But now ye also put off all these; anger, wrath, malice, blasphemy, filthy communication out of your mouth.

THE MONEY

(1 Timothy 3:3)
Not given to wine, no striker, not greedy of filthy lucre; but patient, not a brawler, not covetous;

(1 Timothy 3:8)
Likewise must the deacons be grave, not doubletongued, not given to much wine, not greedy of filthy lucre;

(Titus 1:7)
For a bishop must be blameless, as the steward of God; not selfwilled, not soon angry, not given to wine, no striker, not given to filthy lucre;

(Titus 1:11)
Whose mouths must be stopped, who subvert whole houses, teaching things which they ought not, for filthy lucre's sake.

(1 Peter 5:2)
Feed the flock of God which is among you, taking the oversight thereof, not by constraint, but willingly; not for filthy lucre, but of a ready mind;

MYSTERY BABYLON, THE HARLOT

(Revelation 17:4)
And the woman was arrayed in purple and scarlet colour, and decked with gold and precious stones and pearls, having a golden cup in her hand full of abominations and filthiness of her fornication:

(Isaiah 4:5)
And the LORD will create upon every dwelling place of mount Zion, and upon her assemblies, a cloud and smoke by day, and the shining of a flaming fire by night: for upon all the glory shall be a defence.

Again this has to be the Millennial Kingdom
This is a repeat of the Exodus from Egypt

(Exodus 13:21)
And the LORD went before them by day in a pillar of a cloud, to lead them the way; and by night in a pillar of fire, to give them light; to go by day and night:

(Isaiah 4:6)
And there shall be a tabernacle for a shadow in the daytime from the heat, and for a place of refuge, and for a covert from storm and from rain.

God is to be our shelter, our home, our refuge

(Psalms 9:9)
The LORD also will be a refuge for the oppressed, a refuge in times of trouble. COVERT, n.

1. A covering, or covering place; a place which covers and shelters; a shelter; a defense.
A tabernacle--for a covert from storm and rain. Isa 4.
I will trust in the covert of thy wings. Psa 111.
2. A thicket; a shady place, or a hiding place. 1 Sam 25. Job 38.