וְאֶת־בְּנֵיהֶם֙ הֵקִ֣ים תַּחְתָּ֔ם אֹתָ֖ם מָ֣ל יְהוֹשֻׁ֑עַ כִּי־עֲרֵלִ֣ים הָי֔וּ כִּ֛י לֹא־מָ֥לוּ אוֹתָ֖ם בַּדָּֽרֶךְ׃
And He raised up their children in their stead; them did Joshua circumcise; for they were uncircumcised, because they had not been circumcised by the way.
Read halakhic rulings (Jewish law) on Joshua 5:7: and classical halakhic sources.