John Gills Exposition of the Bible Commentary - Genesis 17:25
And Ishmael his son was thirteen years old when he was circumcised in the flesh of his foreskin. Hence the Arabians, as Josephus F23 Antiqu. l. 1. c. 12. sect. 2. relates, circumcise their children when at thirteen years of age, because Ishmael, the founder of their nation, was circumcised at that age; and Origen F24 Philocalia, c. 23. p. 77. asserts the same; and with which agrees what an Arabic writer says F25 Ebnol Athir apud Pocock. Specimen Arab. Hist. p. 319. of the... read more
Matthew Henry's Complete Commentary - Genesis 17:23-27
We have here Abraham's obedience to the law of circumcision. He himself 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. 1. It was an implicit obedience: He did as God had said to him, and did not ask why or wherefore. God's will was not only a law to him, but a reason; he did it because God told him. 2. It was a speedy obedience: In the self-same day, Gen. 17:23, 26. Sincere... read more