1 Samuel (Author Compiled by Isaiah from records of Samuel, David, Nathan, and Gad.)
15:11It repenteth me that I have set up Saul to be king; for he is turned away from following me, and hath not fulfilled my words. And Samuel was much grieved; and he cried to Jehovah all night.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.