Them — Either their parents, or the rulers of Israel, by Divine permission and indulgence; because they were now on a journey, in which case the passover also might be neglected, Numbers 9:10, Numbers 9:13. Rather, it was a continued token of God's displeasure against them, for their unbelief and murmuring: a token that they should never have the benefit of that promise, whereof circumcision was the seal.
Related Commentaries of Joshua 5:5
Joshua 5:5
5 Now all the people that came out were circumcised: but all the people that were born in the wilderness by the way as they came forth out of Egypt, them they had not circumcised.