Almost 25 years after God calls Abram to leave his home in Mesopotamia and go to the land of Canaan, God formally establishes a covenant with him (Genesis 17:4ff.). Like that established with Noah, his descendants, and all living beings (9:8ff.), it is unconditional, everlasting, includes blessings and promises, and carries with it a sign decided upon by God. However, unlike the rainbow, placed in the clouds and passively received by humanity, the sign of God's covenant with Abraham — male circumcision — is something with which Abram and his descendants, not God, are entrusted. They are to circumcise their sons and other male children in their household on the eighth day after birth as a physical sign of the covenant. The punishment for failing to do so is severe. "An uncircumcised male who has not circumcised the flesh of his foreskin," says God, " … shall be cut off from his people; he has broken My covenant" (17:14).