Genesis 17:23
ESV
Then Abraham took Ishmael his son and all those born in his house or bought with his money, every male among the men of Abraham 's house, and he circumcised the flesh of their foreskins that very day, as God had said to him.
NIV
On that very day Abraham took his son Ishmael and all those born in his household or bought with his money, every male in his household, and circumcised them, as God told him.
NASB
Then Abraham took his son Ishmael, and all the slaves who were born in his house and all who were bought with his money, every male among the men of Abraham’s household, and circumcised the flesh of their foreskin on this very same day, as God had said to him.
CSB
So Abraham took his son Ishmael and those born in his household or purchased—every male among the members of Abraham’s household—and he circumcised the flesh of their foreskin on that very day, just as God had said to him.
NLT
On that very day Abraham took his son, Ishmael, and every male in his household, including those born there and those he had bought. Then he circumcised them, cutting off their foreskins, just as God had told him.
KJV
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 Abraham's house; and circumcised the flesh of their foreskin in the selfsame day, as God had said unto him.
NKJV
So Abraham took Ishmael his son, all who were born in his house and all who were bought with his money, every male among the men of Abraham’s house, and circumcised the flesh of their foreskins that very same day, as God had said to him.
What does Genesis 17:23 mean?
Abraham immediately demonstrates his faith in the God who appeared to him by obeying God's command. Abraham kept his part of the covenant God had initiated by circumcising himself and every male in his extensive household. He did so on the very day God appeared to him, starting with Ishmael, his 13-year-old son.Circumcision was not unheard of in that era, but this does not change the magnitude of Abraham's immediate obedience. Circumcision involves removing the foreskin from the penis, which is painful and, one would assume, awkward. We're not told anything of the reaction to Abraham's requirement for all the men and boys under his care. Abraham overcame whatever resistance may have presented itself to obey the command of the Lord. It's worth noting that those who would have resisted this command entirely had an option, of sorts: to be "cut off," or separated, from the family of Abraham (Genesis 17:14).
Genesis 17:15–27 describes God's surprising revelation to the newly renamed, 99-year-old Abraham: His presumably barren, 89-year-old wife, Sarai, now to be named Sarah, would bear him a son within a year. Ishmael, now 13, would still be abundantly blessed, but this new son, Isaac, would be the one through whom God would keep His covenant promises. As soon as God left, Abraham immediately set about obeying God's command to circumcise himself and every male in his household as a sign of the covenant with the Lord.
God appears to Abram once more in Genesis 17, but this instance is very different from prior meetings. God reconfirms His promises to make Abram a father of nations and to give to him and his descendants the land of Canaan. This time, though, God changes Abram's name to Abraham and gives him a requirement to circumcise himself and every male in his household forever. He also changes Sarai's name to Sarah. God announces that Abraham and Sarah will have a son, after all. His 13-year old son Ishmael will be blessed, but this new son, Isaac, to be born within the year, will be the one to whom God's covenant promises will pass.