Contradiction with Numbers 35:2
This verse specifies that the Levites must be given cities to dwell in, which aligns rather than contradicts with Joshua 21:10 where cities are assigned to them.
Numbers 35:2: Command the children of Israel, that they give unto the Levites of the inheritance of their possession cities to dwell in; and ye shall give [also] unto the Levites suburbs for the cities round about them.
Contradiction with Numbers 18:20
God tells Aaron that he will have no inheritance in their land, while Joshua 21:10 involves inheritance of cities for the Levites.
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 10:9
This verse states that Levi has no part nor inheritance with his brethren, in contrast to Joshua 21:10 where the Levites receive cities.
Deuteronomy 10:9: Wherefore Levi hath no part nor inheritance with his brethren; the LORD [is] his inheritance, according as the LORD thy God promised him.
Contradiction with Ezekiel 44:28
It affirms that the Levites should not have inheritance, differing from Joshua 21:10 wherein they are given cities and lands.
Ezekiel 44:28: And it shall be unto them for an inheritance: I [am] their inheritance: and ye shall give them no possession in Israel: I [am] their possession.