Matthew Poole and continuators on Genesis 17:23

23 And Abraham took Ishmael his Son, and all that were born in his house, and all that were bought with his money, every male among the men of Abrahams▪ house, and circumcised the flesh of their fore-skin in the self-same day , as God had said unto him.

Partly by his own hand, and partly by the help of others, whom he by Divine instinct called to, and directed in that work.

In which God appeared to him and gave the command. So he made hast and delayed not to execute Gods command. And his Servants also yielded a ready and chearful obedience to this severe and painful precept, being moved thereunto by Abrahams example and soveraign Authority, by Gods powerful presence some way or other manifested to them, and by the prospect and hope of Gods blessing to accompany and follow his own Ordinance.