Yehoshua 5:2-4

Orthodox Jewish Bible

² At that time Hashem said unto Yehoshua, Make thee knives of flint, and do a second time the Bris Milah to the Bnei Yisroel.

³ And Yehoshua made him flint knives, and did Bris Milah to the Bnei Yisroel at Givat HaAralot.

⁴ And this is the reason why Yehoshua did the Bris Milah: Kol HaAm that came out of Mitzrayim, that were zekharim (males), even Kol Anshei HaMilchamah, died in the midbar baderech, after they came out of Mitzrayim.