Genesis 17:15-27
15 God continued speaking to Abraham, "And Sarai your wife: Don't call her Sarai any longer; call her Sarah. 16 I'll bless her - yes! I'll give you a son by her! Oh, how I'll bless her! Nations will come from her; kings of nations will come from her." 17 Abraham fell flat on his face. And then he laughed, thinking, "Can a hundred-year-old man father a son? And can Sarah, at ninety years, have a baby?" 18 Recovering, Abraham said to God, "Oh, keep Ishmael alive and well before you!" 19 But God said, "That's not what I mean. Your wife, Sarah, will have a baby, a son. Name him Isaac (Laughter). I'll establish my covenant with him and his descendants, a covenant that lasts forever. 20 "And Ishmael? Yes, I heard your prayer for him. I'll also bless him; I'll make sure he has plenty of children - a huge family. He'll father twelve princes; I'll make him a great nation. 21 But I'll establish my covenant with Isaac whom Sarah will give you about this time next year." 22 God finished speaking with Abraham and left.
23 Then Abraham took his son Ishmael and all his servants, whether houseborn or purchased - every male in his household - and circumcised them, cutting off their foreskins that very day, just as God had told him. 24 Abraham was ninety-nine years old when he was circumcised. 25 His son Ishmael was thirteen years old when he was circumcised. 26 Abraham and Ishmael were circumcised the same day 27 together with all the servants of his household, those born there and those purchased from outsiders - all were circumcised with him.
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Matthew Henry's Commentary on Genesis 17:15-27
Commentary on Genesis 17:15-22
(Read Genesis 17:15-22)
Here is the promise made to Abraham of a son by Sarai, in whom the promise made to him should be fulfilled. The assurance of this promise was the change of Sarai's name into Sarah. Sarai signifies my princess, as if her honour were confined to one family only; Sarah signifies a princess. The more favours God confers upon us, the more low we should be in our own eyes. Abraham showed great joy; he laughed, it was a laughter of delight, not of distrust. Now it was that Abraham rejoiced to see Christ's day; now he saw it and was glad, John 8:56. Abraham, dreading lest Ishmael should be abandoned and forsaken of God, put up a petition on his behalf. God gives us leave in prayer to be particular in making known our requests. Whatever is our care and fear, should be spread before God in prayer. It is the duty of parents to pray for their children, and the great thing we should desire is, that they may be kept in covenant with Him, and may have grace to walk before him in uprightness. Common blessings are secured to Ishmael. Outward good things are often given to those children of godly parents who are born after the flesh, for their parents' sake. Covenant blessings are reserved for Isaac, and appropriated to him.
Commentary on Genesis 17:23-27
(Read Genesis 17:23-27)
Abraham and all his family were circumcised; so receiving the token of the covenant, and distinguishing themselves from other families that had no part nor lot in the matter. It was an implicit obedience; he did as God said unto him, and did not ask why or wherefore. He did it because God bade him. It was a speedy obedience; in the self-same day. Sincere obedience makes no delay. Not only the doctrines of revelation, but the seals of God's covenant, remind us that we are guilty, polluted sinners. They show us our need of the blood of atonement; they point to the promised Saviour, and teach us to exercise faith in him. They show us that without regeneration, and sanctification by his Spirit, and the mortification of our corrupt and carnal inclinations, we cannot be in covenant with God. But let us remember that the true circumcision is that of the heart, by the Spirit, Romans 2:28,29. Both under the old and new dispensation, many have had the outward profession, and the outward seal, who were never sealed by the Holy Spirit of promise.