Genesis 2:21

2:21 So the Lord God caused the man to fall into a deep sleep, and while he was asleep, he took part of the man’s side and closed up the place with flesh.

Genesis 17:13-14

17:13 They must indeed be circumcised, whether born in your house or bought with money. The sign of my covenant will be visible in your flesh as a permanent reminder. 17:14 Any uncircumcised male who has not been circumcised in the flesh of his foreskin will be cut off from his people – he has failed to carry out my requirement.”

Genesis 37:27

37:27 Come, let’s sell him to the Ishmaelites, but let’s not lay a hand on him, for after all, he is our brother, our own flesh.” His brothers agreed.