Genesis 17:24

Abraham's Household Circumcised

²³ Then Abraham took his son Ishmael and all the slaves born in his house or purchased with his money—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. ²⁴ Abraham was 99 years old when the flesh of his foreskin was circumcised, ²⁵ and his son Ishmael was 13 years old when the flesh of his foreskin was circumcised.

Abraham

Romans 4:11

And he received the sign of circumcision as a seal of the righteousness that he had by faith while still uncircumcised. This was to make him the father of all who believe but are not circumcised, so that righteousness may be credited to them also.

Genesis 12:4

So Abram went, as the Lord had told him, and Lot went with him. Abram was 75 years old when he left Haran.

Genesis 17:1

When Abram was 99 years old, the Lord appeared to him, saying, “I am God Almighty. Live in My presence and be blameless.

Genesis 17:17

Abraham fell facedown. Then he laughed and said to himself, “Can a child be born to a hundred-year-old man? Can Sarah, a ninety-year-old woman, give birth?”

Romans 4:19-20

He considered his own body to be already dead (since he was about 100 years old) and also considered the deadness of Sarah’s womb, without weakening in the faith.