Jeremiah 38:26

Then thou shalt say unto them, I presented my supplication before the king, that he would not cause me to return to Jonathan’s house, to die there.

Cross-reference

Jeremiah 37:15 records Jeremiah's earlier beating and imprisonment in the house of Jonathan, explaining why he feared returning there.

Jeremiah 37:20 contains the actual plea Jeremiah refers to—asking the king not to send him back to Jonathan's house.