Genesis 17 goes out of its way to point out that Isaac is conceived by a circumcised Abraham, unlike Ishmael.
Abraham circumcises Ishmael and himself the same day God commands it, and Isaac is born about a year later. Abraham wishes Ishmael could be the one, since he's already 13, but God's consecration is needed.
It is important that Isaac come forth by God's choice (not by Abraham and Sarah's choice as Ishmael did), with God's sign placed on Abraham and Isaac by Abraham, from the start.
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