Jeremiah 39:12

Take him, and look well to him, and do him no harm; but do unto him even as he shall say unto thee.

Cross-reference

Jeremiah 40:4 Historical context

Jeremiah 40:4 directly carries out this command — the captain of the guard repeats 'look after you' when freeing Jeremiah.

Jeremiah 15:11 Prophetic fulfillment

Jeremiah 15:11 promised enemies would entreat Jeremiah well; here Nebuchadnezzar orders his protection, fulfilling that.

Psalm 105:15 commands 'do my prophets no harm' — Nebuchadnezzar's order to not harm Jeremiah obeys this directly.

Proverbs 16:7 says God makes enemies at peace — here the enemy king commands protection, exemplifying that principle.

Proverbs 21:1 teaches that the king's heart is in God's hand — Nebuchadnezzar's protective order shows God directing him.

Amos 9:4 Contrast

Amos 9:4 says God sets His eye for harm, while here the king sets his eye for good — exact opposite outcomes of the same idiom.

Psalm 105:14 describes God rebuking kings for His people — here a pagan king is commanded to protect His prophet.