Commentary for Joshua 24:22

You are witnesses against yourselves. Yehoshua foresaw that in the future, they would undermine [the covenant] in the days of Yechezkeil and say, “We want to be like the [other] nations,” and therefore he was so hard on them now. Therefore it was said to them in the days of Yechezkeil, “The thought you entertain will never come to pass etc., As I live says Adonoy, God, I will rule over you with a strong hand etc.”¹¹ See Yechezkeil 20:32,33. You have already accepted upon yourselves [the covenant] in the days of Yehoshua. And you can not say “We only accepted it upon ourselves in the days of Moshe because we wanted [God’s help] to enter the land,” since in the days of Yehoshua you had already entered the land, and [yet] you accepted the covenant.