Genesis 18: 1 - 10
1 And the LORD appeared to him by the oaks of Mamre, as he sat at the door of his tent in the heat of the day.
2 He lifted up his eyes and looked, and behold, three men stood in front of him. When he saw them, he ran from the tent door to meet them, and bowed himself to the earth,
3 and said, "My lord, if I have found favor in your sight, do not pass by your servant.
4 Let a little water be brought, and wash your feet, and rest yourselves under the tree,
5 while I fetch a morsel of bread, that you may refresh yourselves, and after that you may pass on -- since you have come to your servant." So they said, "Do as you have said."
6 And Abraham hastened into the tent to Sarah, and said, "Make ready quickly three measures of fine meal, knead it, and make cakes."
7 And Abraham ran to the herd, and took a calf, tender and good, and gave it to the servant, who hastened to prepare it.
8 Then he took curds, and milk, and the calf which he had prepared, and set it before them; and he stood by them under the tree while they ate.
9 They said to him, "Where is Sarah your wife?" And he said, "She is in the tent."
10 The LORD said, "I will surely return to you in the spring, and Sarah your wife shall have a son." And Sarah was listening at the tent door behind him.

EWTN