Charles Ellicott Commentary Jeremiah 1:7

"But Jehovah said unto me, Say not, I am a child; for to whomsoever I shall send thee thou shalt go, and whatsoever I shall command thee thou shalt speak." — Jeremiah 1:7 (ASV)

The Lord said unto me. —The misgiving, which was not reluctance, is met by words of encouragement. God gave the work; He would also give the power.