Genesis 18:2-5

2And he lifted up his eyes and saw, and behold, three men standing near him. And when he saw [them], he ran to meet them from the tent-door, and bowed himself to the earth,

3and said, Lord, if now I have found favour in thine eyes, pass not away, I pray thee, from thy servant.

4Let now a little water be fetched, that ye may wash your feet, and rest yourselves under the tree.

5And I will fetch a morsel of bread; and refresh yourselves; after that ye shall pass on; for therefore have ye passed on towards your servant. And they said, So do as thou hast said.