Genesis 18:1-7

Now the LORD appeared to Abraham by the terebinth trees of Mamre [in Hebron], while he was sitting at the tent door in the heat of the day. 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.” So Abraham hurried into the tent to Sarah, and said, “Quickly, get ready three measures of fine meal, knead it and bake cakes.” Abraham also ran to the herd and brought a calf, tender and choice, and he gave it to the servant [to butcher], and he hurried to prepare it.