1 Samuel 16:3-6

Invite Jesse to the sacrifice, and I will show you which of his sons to anoint for me.” So Samuel did as the LORD instructed. When he arrived at Bethlehem, the elders of the town came trembling to meet him. “What’s wrong?” they asked. “Do you come in peace?” “Yes,” Samuel replied. “I have come to sacrifice to the LORD. Purify yourselves and come with me to the sacrifice.” Then Samuel performed the purification rite for Jesse and his sons and invited them to the sacrifice, too. When they arrived, Samuel took one look at Eliab and thought, “Surely this is the LORD’s anointed!”