1 Samuel 16:1-2

The LORD said to Samuel, “How long will you grieve over Saul, since I have rejected him from being king over Israel? Fill your horn with oil, and go. I will send you to Jesse the Bethlehemite, for I have provided for myself a king among his sons.” And Samuel said, “How can I go? If Saul hears it, he will kill me.” And the LORD said, “Take a heifer with you and say, ‘I have come to sacrifice to the LORD.’