Contradiction with Joshua 13:1
Joshua 21:13 mentions the provision for the Levites, whereas Joshua 13:1 implies the land allocations were incomplete.
Joshua 13:1: Now Joshua was old [and] stricken in years; and the LORD said unto him, Thou art old [and] stricken in years, and there remaineth yet very much land to be possessed. [to...: Heb. to possess it]
Contradiction with Numbers 18:20
Joshua 21:13 assigns cities to the Levites, while this verse indicates they would not have a portion of land.
Numbers 18:20: And the LORD spake unto Aaron, Thou shalt have no inheritance in their land, neither shalt thou have any part among them: I [am] thy part and thine inheritance among the children of Israel.
Contradiction with Deuteronomy 18:2
This verse states the Levites have no inheritance among their brothers, contrasting with their assignment of cities in Joshua 21:13.
Deuteronomy 18:2: Therefore shall they have no inheritance among their brethren: the LORD [is] their inheritance, as he hath said unto them.
Contradiction with Psalm 115:16
Implies the heavens are for God but earth is given to men, questioning why land is given specifically to priests in Joshua 21:13.
Psalm 115:16: The heaven, [even] the heavens, [are] the LORD'S: but the earth hath he given to the children of men.
Contradiction with Acts 7:5
Refers to God not giving Abraham any inheritance in the land, opposing the inheritance given to the Levites in Joshua 21:13.
Acts 7:5: And he gave him none inheritance in it, no, not [so much as] to set his foot on: yet he promised that he would give it to him for a possession, and to his seed after him, when [as yet] he had no child.