Exodus 4:25
“Then Zipporah took a sharp stone, and cut off the foreskin of her son, and cast it at his feet, and said, Surely a bloody husband art thou to me.”
And I say unto thee, Let my son go, that he may serve me: and if thou refuse to let him go, behold, I will slay thy son, even thy firstborn.
And it came to pass by the way in the inn, that the Lord met him, and sought to kill him.
Then Zipporah took a sharp stone, and cut off the foreskin of her son, and cast it at his feet, and said, Surely a bloody husband art thou to me.
So he let him go: then she said, A bloody husband thou art, because of the circumcision.
And the Lord said to Aaron, Go into the wilderness to meet Moses. And he went, and met him in the mount of God, and kissed him.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“At that time the Lord said unto Joshua, Make thee sharp knives, and circumcise again the children of Israel the second time.”
“And ye shall circumcise the flesh of your foreskin; and it shall be a token of the covenant betwixt me and you.”
“And the uncircumcised man child whose flesh of his foreskin is not circumcised, that soul shall be cut off from his people; he hath broken my covenant.”
“This is my covenant, which ye shall keep, between me and you and thy seed after thee; Every man child among you shall be circumcised.”
“Then Jethro, Moses’ father in law, took Zipporah, Moses’ wife, after he had sent her back,”