Contradiction with Numbers 3:10
This verse states that only Aaron and his descendants can serve as priests, contradicting the open mention of other families serving in the priesthood in 1 Chronicles 9:15.
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 1 Samuel 1:1
This verse introduces Elkanah from the tribe of Ephraim, which cannot have Levites as priests, contradicting claims of varied tribal origin in the service roles suggested in 1 Chronicles 9:15.
1 Samuel 1:1: Now there was a certain man of Ramathaimzophim, of mount Ephraim, and his name [was] Elkanah, the son of Jeroham, the son of Elihu, the son of Tohu, the son of Zuph, an Ephrathite:
Contradiction with Hebrews 7:12
This verse indicates a change in priesthood necessitating a change in law, which suggests a different structure than described in 1 Chronicles 9:15.
Hebrews 7:12: For the priesthood being changed, there is made of necessity a change also of the law.