The Son of Promise (Genesis 18)

        as he was sitting in the tent door in the heat of the day.  So he lifted his eyes and looked, and behold, three men were standing by him; and when he saw them, he ran from the tent door to meet them, and bowed himself to the ground.   and said, "My Lord, if I have now found favor in Your sight, do not pass on by Your servant.  Please let a little water be brought, and wash your feet, and rest yourselves under the tree.