Genesis 18:2-4
2And he lift up his eyes and looked, and, lo, three men stood by him: and when he saw them, he ran to meet them from the tent door, and bowed himself toward the ground, 3And said, My Lord, if now I have found favour in thy sight, pass not away, I pray thee, from thy servant: 4Let a little water, I pray you, be fetched, and wash your feet, and rest yourselves under the tree: