1 Samuel 16:1-3

The LORD said to Samuel, “How long will you grieve for Saul, when I have rejected him as king over Israel? Fill your horn with oil and go; I will send you to Jesse the Bethlehemite, for I have chosen a king for Myself among his sons.” But Samuel said, “How can I go? When Saul hears about it, he will kill me.” And the LORD said, “Take a heifer from the herd with you and say, ‘I have come to sacrifice to the Lord.’ You shall invite Jesse to the sacrifice, and I will show you what you shall do [after that]; and you shall anoint for Me the one whom I designate.”