Genesis 18:2-5

When he raised his eyes and looked up, behold, three men were standing [a little distance] from him. When he saw them, he ran from the tent door to meet them and bowed down [with his face] to the ground, and Abraham said, “My lord, if now I have found favor in your sight, please do not pass by your servant [without stopping to visit]. Please let a little water be brought [by one of my servants] and [you may] wash your feet, and recline and rest comfortably under the tree. And I will bring a piece of bread to refresh and sustain you; after that you may go on, since you have come to your servant.” And they replied, “Do as you have said.”