John Gills Exposition of the Bible Commentary - Genesis 17:26
In the selfsame day was Abraham circumcised, and Ishmael his son. This is repeated, that it might be taken notice of that both were circumcised according to the command of God, and on the very day in which it was given. Jarchi observes, it was in the day, and not in the night; which shows, says he, he was not afraid of the Heathen, and of mockers; and that his enemies, and the men of that generation, might not say, if we had seen him, we would not have suffered him to be circumcised, and... 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