Contradiction with Numbers 20:28
This verse indicates the actual fulfillment of the command given in Numbers 20:25, thus not a contradiction, but its execution, which contrasts with other representations of consequences without direct transference like found in Numbers 12:1-10.
Numbers 20:28: And Moses stripped Aaron of his garments, and put them upon Eleazar his son; and Aaron died there in the top of the mount: and Moses and Eleazar came down from the mount.
Contradiction with Exodus 28:1
This verse appoints Aaron and his sons as priests, which contradicts Numbers 20:25 since it discusses Aaron's removal.
Exodus 28:1: And take thou unto thee Aaron thy brother, and his sons with him, from among the children of Israel, that he may minister unto me in the priest's office, [even] Aaron, Nadab and Abihu, Eleazar and Ithamar, Aaron's sons.
Contradiction with Hebrews 7:23-24
Speaks of a permanent priesthood, contrasting with the replacement of Aaron in Numbers 20:25.
Hebrews 7:23-24: And they truly were many priests, because they were not suffered to continue by reason of death:
Contradiction with Numbers 3:10
Assigns Aaron and his sons to maintain the priesthood permanently, conflicting with Aaron's removal in Numbers 20:25.
Numbers 3:10: And thou shalt appoint Aaron and his sons, and they shall wait on their priest's office: and the stranger that cometh nigh shall be put to death.
Contradiction with Psalm 110:4
References an eternal priesthood, which contradicts the succession seen in Numbers 20:25.
Psalm 110:4: The LORD hath sworn, and will not repent, Thou [art] a priest for ever after the order of Melchizedek.