1 Samuel 16:2-5

2And Samuel said, “How can I go? If Saul hears it, he will kill me.” But the Lord said, “Take a heifer with you, and say, ‘I have come to sacrifice to the Lord.’

3Then invite Jesse to the sacrifice, and I will show you what you shall do; you shall anoint for Me the one I name to you.”

4So Samuel did what the Lord said, and went to Bethlehem. And the elders of the town trembled at his coming, and said, “Do you come peaceably?”

5And he said, “Peaceably; I have come to sacrifice to the Lord. Sanctify yourselves, and come with me to the sacrifice.” Then he consecrated Jesse and his sons, and invited them to the sacrifice.