Genesis, Chapter 18, verses 1-15
1 Abraham entertaineth three angels, 9 Sarah is reproved for laughing at the strange promiseMatthew, Chapter 8, verses 5-17
5 heals the centurion's servant, 14 Peter's mother-in-law, 16 and many other diseased8
8:5 There came to him a centurion - A captain of a hundred Roman soldiers. Probably he came a little way toward him, and then went back. He thought himself not worthy to come in person, and therefore spoke the words that follow by his messengers. As it is not unusual in all languages, so in the Hebrew it is peculiarly frequent, to ascribe to a person himself the thing which is done, and the words which are spoken by his order. And accordingly St.Matthew relates as said by the centurion himself, what others said by order from him. An instance of the same kind we have in the case of Zebedee's children. From St. Matthew, Mat 20:20, we learn it was their mother that spoke those words, which, Mar 10:35, Mar 10:37, themselves are said to speak; because she was
only their mouth. Yet from Mat 8:13, Go thy way home, it appears he at
length came in person, probably on hearing that Jesus was nearer to his house than he apprehended when he sent the second message by his friends. Luk 7:1.
8:8 The centurion answered - By his second messengers.
8:9 For I am a man under authority - I am only an inferior officer: and what I command, is done even in my absence: how much more what thou commandest, who art Lord of all!
8:10 I have not found so great faith, no, not in Israel - For the centurion was not an Israelite.
8:11 Many from the farthest parts of the earth shall embrace the terms and enjoy the rewards of the Gospel covenant established with Abraham. But the Jews, who have the first title to them, shall be shut out from the feast; from grace here, and hereafter from glory. Luk 13:29.
8:12 The outer darkness - Our Lord here alludes to the custom the ancients had of making their feast in the night time. Probably while he was speaking this, the centurion came in person.
8:14 Peter's wife's mother - St. Peter was then a young man, as were all the apostles. Mar 1:29; Luk 4:38.
8:17 Whereby was fulfilled what was spoken by the Prophet Isaiah - He spoke it in a more exalted sense. The evangelist here onlyalludes to those words, as being capable of this lower meaning also. Such instances are frequent in the sacred writings, and are elegancies rather than imperfections. He fulfilled these words in the highest sense, by bearing our sins in his own body on the tree: in a lower sense, by sympathizing with us in our sorrows, and healing us of the diseases which were the fruit of sin. Isa 53:4.

18 We have an account in this chapter of another interview between God and Abraham, probably within a few days after the former, as the reward of his chearful obedience to the law of circumcision.Here is,
18:1 This appearance of God to Abraham seems to have had in it more of freedom and familiarity, and less of grandeur and majesty, than those we have hitherto read of, and therefore more resembles that great visit which in the fulness of time the Son of God was to make to the world. He sat in the tent - door in the heat of the day - Not so much to repose himself, as to seek an opportunity of doing good, by giving entertainment to strangers.
18:2 And lo three men - These three men were three spiritual heavenly beings, now assuming human shapes, that they might be visible to Abraham, and conversable with him. Some think they were all three created angels; others, that one of them was the Son of God. He bowed himself towards the ground - Religion doth not destroy but improve good manners, and teaches us to honour all men.
18:9 Where is Sarah thy wife? - By naming her, they gave intimation to Abraham, that tho' they seemed strangers, yet they well knew him and his family: by enquiring after her, they shewed a kind concern for the family of one, whom they found respectful to them. And by speaking of her, she over - hearing it, they drew her to listen to what was farther to be said.
18:10 I will certainly return unto thee - And visit thee. God will return to those that bid him welcome.
18:12 Sarah laughed within herself - It was not a laughter of faith, like Abraham's, Gen 17:17, but a laughter of doubting and distrust.The great objection which Sarah could not get over was her age.I am waxed old, and past child - bearing in a course of nature, especially having been hitherto barren, and which magnifies the difficulty, My lord is old also. Observe here, That Sarah calls Abraham her lord, and the Holy Ghost takes notice of it to her honour, and recommends it to the imitation of all Christian wives, Pe1 3:6.Sarah obeyed Abraham calling him lord, in token of respect and subjection.