John Gill Commentary Jeremiah 39:18

"For I will surely save thee, and thou shalt not fall by the sword, but thy life shall be for a prey unto thee; because thou hast put thy trust in me, saith Jehovah." — Jeremiah 39:18 (ASV)

For I will surely deliver you
Or, in "delivering will deliver you" ^F16; this is a repetition and confirmation of what is promised in (Jeremiah 39:17), and more fully explains it:

and you shall not fall by the sword:
by the sword of the Chaldeans, when the city should be taken, as he feared he should:

but your life shall be for a prey unto you:
shall be safe; be like a prey taken out of the hand of the mighty, and be enjoyed beyond expectation, having been given up for lost; and therefore matter of the greater joy, such as is expressed at the taking of spoils:

because you have put your trust in me, says the Lord.

The Targum is, "in my word"; what he had done in serving the prophet, and other good actions, sprung from a principle of faith and confidence in the Lord; and this the Lord had a respect unto; without which works are not right; and without which it is impossible to please God with them; and which faith may be, and be true, where fears are.

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FOOTNOTES:

• F16: (Kjlma jlm) "eripiendo eripiam te", Schmidt; "eruendo eruam te", Pagninus, Montanus.