1 Samuel (Author Compiled by Isaiah from records of Samuel, David, Nathan, and Gad.)
15:15And Saul said, They have brought them from the Amalekites: for the people spared the best of the sheep and of the oxen, to sacrifice unto the LORD thy God; and the rest we have utterly destroyed.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.