Genesis 18:9

During the meal, at which Abraham stood, and waited upon them as the host, they asked for Sarah, for whom the visit was chiefly intended. On being told that she was in the tent, where she could hear, therefore, all that passed under the tree in front of the tent, the one whom Abraham addressed as Adonai (my Lord), and who is called Jehovah in Gen 18:13, said, "I will return to thee (חיּה כּעת) at this time, when it lives again" (חיּה, reviviscens, without the article, Ges. 111, 2b), i.e., at this time next year; "and, behold, Sarah, thy wife, will (then) have a son." Sarah heard this at the door of the tent; "and it was behind Him" (Jehovah), so that she could not be seen by Him as she stood at the door. But as the fulfilment of this promise seemed impossible to her, on account of Abraham's extreme age, and the fact that her own womb had lost the power of conception, she laughed within herself, thinking that she was not observed. But that she might know that the promise was made by the omniscient and omnipotent God, He reproved her for laughing, saying, "Is anything too wonderful (i.e., impossible) for Jehovah? at the time appointed I will return unto thee," etc.; and when her perplexity led her to deny it, He convicted her of falsehood. Abraham also had laughed at this promise (Gen 17:17), and without receiving any reproof. For his laughing was the joyous outburst of astonishment; Sarah's, on the contrary, the result of doubt and unbelief, which had to be broken down by reproof, and, as the result showed, really was broken down, inasmuch as she conceived and bore a son, whom she could only have conceived in faith (Heb 11:11).

These heavenly guests (being sent to confirm the promise lately made to Abraham, that he should have a son by Sarah), while they are receiving Abraham's kind entertainment, they return his kindness. He receives angels, and has angels' rewards, a gracious message from heaven, Mat 10:41. I. Care is taken that Sarah should be within hearing. She must conceive by faith, and therefore the promise must be made to her, Heb 11:11. It was the modest usage of that time that the women did not sit at meat with men, at least not with strangers, but confined themselves to their own apartments; therefore Sarah is here out of sight: but she must not be out of hearing. The angels enquire (Gen 18:9), Where is Sarah thy wife? By naming her, they gave intimation enough to Abraham that, though they seemed strangers, yet they very well knew him and his family. By enquiring after her, they showed a friendly kind concern for the family and relations of one whom they found respectful to them. It is a piece of common civility, which ought to proceed from a principle of Christian love, and then it is sanctified. And, by speaking of her (she over-hearing it), they drew her to listen to what was further to be said. Where is Sarah thy wife? say the angels. "Behold in the tent," says Abraham. "Where should she be else? There she is in her place, as she uses to be, and is now within call." Note, 1. The daughters of Sarah must learn of her to be chaste, keepers at home, Tit 2:5. There is nothing got by gadding. 2. Those are most likely to receive comfort from God and his promises that are in their place and in the way of their duty, Luk 2:8. II. The promise is then renewed and ratified, that she should have a son (Gen 18:10): "I will certainly return unto thee, and visit thee next time with the perform…

18:9 The visitors’ rhetorical question focuses attention on Sarah, whom the visitors knew by name.