TSK · Deuteronomy 2:16

When they had gone out of the city, and were not yet far off, Joseph said to his steward, "Up, follow after the men. When you overtake them, ask them, 'Why have you rewarded evil for good?

This is the reason Joshua circumcised: all the people who came out of Egypt, who were males, even all the men of war, died in the wilderness by the way, after they came out of Egypt.