Joshua 5:2
“At that time the Lord said unto Joshua, Make thee sharp knives, and circumcise again the children of Israel the second time.”
And it came to pass, when all the kings of the Amorites, which were on the side of Jordan westward, and all the kings of the Canaanites, which were by the sea, heard that the Lord had dried up the waters of Jordan from before the children of Israel, until we were passed over, that their heart melted, neither was there spirit in them any more, because of the children of Israel.
At that time the Lord said unto Joshua, Make thee sharp knives, and circumcise again the children of Israel the second time.
And Joshua made him sharp knives, and circumcised the children of Israel at the hill of the foreskins.
And this is the cause why Joshua did circumcise: All the people that came out of Egypt, that were males, even all the men of war, died in the wilderness by the way, after they came out of Egypt.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“Circumcise therefore the foreskin of your heart, and be no more stiffnecked.”
“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 the Lord thy God will circumcise thine heart, and the heart of thy seed, to love the Lord thy God with all thine heart, and with all thy soul, that thou mayest live.”
“All their wickedness is in Gilgal: for there I hated them: for the wickedness of their doings I will drive them out of mine house, I will love them no more: all their princes are revolters.”
“And they said unto them, We cannot do this thing, to give our sister to one that is uncircumcised; for that were a reproach unto us:”