Joshua 5:2-5
A New Generation is Circumcised
5:2 At that time the Lord told Joshua, “Make flint knives and circumcise the Israelites once again.”
5:3 So Joshua made flint knives and circumcised the Israelites on the Hill of the Foreskins.
5:4 This is why Joshua had to circumcise them: All the men old enough to fight when they left Egypt died on the journey through the desert after they left Egypt.
5:5 Now all the men who left were circumcised, but all the sons born on the journey through the desert after they left Egypt were uncircumcised.