Genesis 17:13-14 makes circumcision an everlasting covenant in the flesh, binding on the son born in the house and the slave bought with money, and says any uncircumcised male “shall be cut off from his people”. The argument stresses the word everlasting.
If the covenant is perpetual, the question is on what authority it was set aside, and what it means that the penalty for neglect, being cut off, is so severe.
both he who is born in your house and he who is bought with your money, shall surely be circumcised. So shall my covenant be in your flesh an everlasting covenant.
Genesis 17:13
Any uncircumcised male who is not circumcised in the flesh of his foreskin shall be cut off from his people; he has broken my covenant.”
Genesis 17:14
Source: see Credits and references (no. 7, p. 7).