Joshua 5:3-5

Young's Literal Translation

³ and Joshua maketh for him knives of flint, and circumciseth the sons of Israel at the height of the foreskins.

⁴ And this [is] the thing [for] which Joshua circumciseth [them]: all the people who are coming out of Egypt, who are males, all the men of war have died in the wilderness, in the way, in their coming out of Egypt,

⁵ for all the people who are coming out were circumcised, and all the people who [are] born in the wilderness, in the way, in their coming out from Egypt, they have not circumcised;