Joshua 5:2-5King James Version (KJV)
2 At that time the Lord said unto Joshua, Make thee sharp knives, and circumcise again the children of Israel the second time.
3 And Joshua made him sharp knives, and circumcised the children of Israel at the hill of the foreskins.
4 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.
5 Now all the people that came out were circumcised: but all the people that were born in the wilderness by the way as they came forth out of Egypt, them they had not circumcised.