11 You must be circumcised in the flesh of your foreskin, and this will become a sign of the covenant between Me and you.
12 Also your eight-day-olds must be circumcised, every male, throughout your generations, including a house-born slave or a slave bought with money from any foreigner who is not of your seed.
13 Your house-born slave and your purchased slave must surely be circumcised. So My covenant will be in your flesh for an everlasting covenant.
14 But the uncircumcised male who is not circumcised in the flesh of his foreskin—that person will be cut off from his people; he has broken My covenant.”
15 God also said to Abraham, “As for Sarai your wife, you shall not call her by the name Sarai. Rather, Sarah is her name.
16 And I will bless her, and moreover, I will give you a son from her. I will bless her and she will give rise to nations. Kings of the peoples will come from her.”
17 Then Abraham fell on his face and laughed, and said to his heart, “Will a son be born to a 100-year-old man? Or will Sarah—who is 90 years old—give birth?”