Ibn Ezra on Isaiah
Isaiah 4
Seven. That is, many; seven is used in this sense because it is the number of the days of the week. All this (that is mentioned in this verse) will happen in consequence of the death of the male persons in battle.
The branch of the Lord. Some refer this to Hezekiah; I think that it signifies the righteous portions of the inhabitants of Jerusalem that will be saved. צבי Beauty (comp. Ez. 20:6); according to some, desire; comp. the Chaldæan יצבא he desires (Dan. 4:14). R. Moses Hakkohen takes it literally: God will send his blessing upon the plants and fruits.
That is written, etc. I shall explain this in the minor prophets (Mal. 3:16).
אם For or when.—The remainder will be called holy, when the Lord will have washed away all these from Zion. ידיח Shall have purged; comp. ידיחו they shall wash (Ez. 1. 38). בער Removing; comp. ובערת And thou shalt put away (Deut. 21:21)
You arrive at the cited line; the whole work is yours to read around it. The text is set from the cited public-domain edition.