1 Samuel 24:5-7King James Version (KJV)
5 And it came to pass afterward, that David's heart smote him, because he had cut off Saul's skirt.
6 And he said unto his men, The Lord forbid that I should do this thing unto my master, the Lord's anointed, to stretch forth mine hand against him, seeing he is the anointed of the Lord.
7 So David stayed his servants with these words, and suffered them not to rise against Saul. But Saul rose up out of the cave, and went on his way.