First Book of Kings (Author Compiled by Isaias from records of Samuel, David, Nathan, and Gad.)
15:20And Saul said to Samuel: Yea, I have hearkened to the voice of the Lord, and have walked in the way by which the Lord sent me, and have brought Agag, the king of Amalec, and Amalec I have slain.
Original from Project Gutenberg - Massive cleanup of OCR problems and editing done locally.