Genesis 18:1-5

Now the LORD appeared to Abraham by the oaks of Mamre, while he was sitting at the tent door in the heat of the day. When he raised his eyes and looked, behold, three men were standing opposite him; and when he saw them, he ran from the tent door to meet them and bowed down to the ground, and said, “My Lord, if now I have found favor in Your sight, please do not pass Your servant by. Please let a little water be brought and wash your feet, and make yourselves comfortable under the tree; and I will bring a piece of bread, so that you may refresh yourselves; after that you may go on, since you have visited your servant.” And they said, “So do as you have said.”