John Gill Commentary Jeremiah 44:27

"Behold, I watch over them for evil, and not for good; and all the men of Judah that are in the land of Egypt shall be consumed by the sword and by the famine, until there be an end of them." — Jeremiah 44:27 (ASV)

Behold, I will watch over them for evil, and not for good , &c.] To bring the evil of punishment upon them, the particulars of which are after mentioned, and not the blessings of goodness, as formerly; and this he would be as careful and diligent to bring about, as one that watches all opportunities to do hurt to another; and it must be dreadful to be under the vigilant avenging eye of God:

and all the men of Judah that [are] in the land of Egypt shall be consumed by the sword, and by the famine, until there be an end of them ; that is, the greatest part of them, excepting a few that shall escape, hereafter mentioned, particularly Jeremiah and Baruch; but as for the main body of such, who went of their own accord to Egypt, and settled, and fell: into the idolatry of the country; these should all perish one after another, till there were none of them left; either by the sword of the king of Babylon; or by famine, which his army and sieges would produce; or by pestilence, though not here mentioned, yet is in (Jeremiah 44:13) .