1 Samuel 16:4

²  And Samuel said, How can I go? if Saul hear it, he will kill me. And the LORD said, Take an heifer with thee, and say, I am come to sacrifice to the LORD.

³  And call Jesse to the sacrifice, and I will show thee what thou shalt do: and thou shalt anoint unto me him whom I name unto thee.

⁴  And Samuel did that which the LORD spake, and came to Bethlehem. And the elders of the town trembled at his coming, and said, Comest thou peaceably?

⁵  And he said, Peaceably: I am come to sacrifice unto the LORD: sanctify yourselves, and come with me to the sacrifice. And he sanctified Jesse and his sons, and called them to the sacrifice.

⁶  And it came to pass, when they were come, that he looked on Eliab, and said, Surely the LORD's anointed is before him.