Moses
Genesis 17:11ESV·traditional attribution

You shall be circumcised in the flesh of your foreskins, and it shall be a sign of the covenant between me and you.

John Calvin Reformed @genevareformer

11. Ye shall circumcise the flesh of your foreskin Very strange and unaccountable would this command at first sight appear. The subject treated of, is the sacred covenant, in which righteousness, salvation, and happiness are promised; whereby the seed of Abraham is distinguished from other nations, in order that it may be holy and blessed; and who can say that it is reasonable for the...

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. The continuance of the covenant, intimated in three things: - 1. It is established; not to be altered nor revoked. It is fixed, it is ratified, it is made as firm as the divine power and truth can make it. 2.

Commenting on Genesis 17:7-14

John Gill Reformed Baptist @doctorgill

And ye shall circumcise the flesh of your foreskin,.... Or "the foreskin of your flesh" (u); by an hypallage (v), the manner in which this was performed may be seen in the Jewish writers (w), as well as the cure of the wound made, is particularly described by Leo Modena (x), and which when performed, they used to provide a dish full of sand to...