Contradiction with Exodus 20:13
The instruction against killing in the Ten Commandments can be seen to contradict the requirement for animal sacrifices as commanded in Numbers 28:4.
Exodus 20:13: Thou shalt not kill.
Contradiction with Hebrews 10:4
This verse states that it is impossible for the blood of bulls and goats to take away sins, contradicting the practice of sacrificial offerings prescribed in Numbers 28:4.
Hebrews 10:4: For [it is] not possible that the blood of bulls and of goats should take away sins.