Joshua 5:5-6

5All the people that came out had been circumcised, but all the people born in the wilderness during the journey from Egypt had not. 6The Israelites had moved about in the wilderness forty years until all the men who were of military age when they left Egypt had died, since they had not obeyed the LORD . For the LORD had sworn to them that they would not see the land he had solemnly promised their ancestors to give us, a land flowing with milk and honey.