Contradiction with Numbers 3:45
Contradicts Numbers 3:44 as it continues the instruction that contradicts the intent stated in 3:44 regarding the exchange of the firstborn.
Numbers 3:45: Take the Levites instead of all the firstborn among the children of Israel, and the cattle of the Levites instead of their cattle; and the Levites shall be mine: I [am] the LORD.
Contradiction with Numbers 3:12
Contradicts by stating that God has already taken the Levites instead of all the firstborn of Israel, which presents a different reasoning for the exchange described in Numbers 3:44.
Numbers 3:12: And I, behold, I have taken the Levites from among the children of Israel instead of all the firstborn that openeth the matrix among the children of Israel: therefore the Levites shall be mine;