181 Then the Lord appeared to him by the terebinth trees of Mamre, as he was sitting in the tent door in the heat of the day. 2 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, 3 and said, "My Lord, if I have now found favor in Your sight, do not pass on by Your servant. 4 Please let a little water be brought, and wash your feet, and rest yourselves under the tree. 5 And I will bring a morsel of bread, that you may refresh your hearts. After that you may pass by, inasmuch as you have come to your servant." They said, "Do as you have said." 6 So Abraham hurried into the tent to Sarah and said, "Quickly, make ready three measures of fine meal; knead it and make cakes." 7 And Abraham ran to the herd, took a tender and good calf, gave it to a young man, and he hastened to prepare it. 8 So he took butter and milk and the calf which he had prepared, and set it before them; and he stood by them under the tree as they ate.
9 Then they said to him, "Where is Sarah your wife?" So he said, "Here, in the tent." 10 And He said, "I will certainly return to you according to the time of life, and behold, Sarah your wife shall have a son." (Sarah was listening in the tent door which was behind him.) 11 Now Abraham and Sarah were old, well advanced in age; and Sarah had passed the age of childbearing. 12 Therefore Sarah laughed within herself, saying, "After I have grown old, shall I have pleasure, my lord being old also?" 13 And the Lord said to Abraham, "Why did Sarah laugh, saying, 'Shall I surely bear a child, since I am old?' 14 Is anything too hard for the Lord? At the appointed time I will return to you, according to the time of life, and Sarah shall have a son." 15 But Sarah denied it, saying, "I did not laugh," for she was afraid. And He said, "No, but you did laugh!"
Matthew Henry's Commentary on Genesis 18:1-15
Commentary on Genesis 18:1-8
(Read Genesis 18:1-8)
Abraham was waiting to entertain any weary traveller, for inns were not to be met with as among us. While Abraham was thus sitting, he saw three men coming. These were three heavenly beings in human bodies. Some think they were all created angels; others, that one of them was the Son of God, the Angel of the covenant. Washing the feet is customary in those hot climates, where only sandals are worn. We should not be forgetful to entertain strangers, for thereby some have entertained angels unawares, Revelation 3:20.
Commentary on Genesis 18:9-15
(Read Genesis 18:9-15)
Where is Sarah thy wife? was asked. Note the answer, In the tent. Just at hand, in her proper place, occupied in her household concerns. There is nothing got by gadding. Those are most likely to receive comfort from God and his promises, who are in their proper place, and in the way of their duty, 17; but He who searches the heart, saw that the one sprung from unbelief, and the other from faith. She denied that she had laughed. One sin commonly brings in another, and it is not likely we shall strictly keep to truth, when we question the Divine truth. But whom the Lord loves he will rebuke, convict, silence, and bring to repentance, and if they sin before him.