Genesis 18:2-3, 8

He looked up and noticed three men standing nearby. When he saw them, he ran to meet them and welcomed them, bowing low to the ground. “My lord,” he said, “if it pleases you, stop here for a while.

When the food was ready, Abraham took some yogurt and milk and the roasted meat, and he served it to the men. As they ate, Abraham waited on them in the shade of the trees.