Contradiction with Exodus 28:41
Contradiction arises because Exodus 28:41 mentions anointing, consecrating, and sanctifying Aaron and his sons, which aligns rather than contradicts the instruction to bring Aaron and his sons to the door of the tabernacle to wash them, as described in Exodus 40:12.
Exodus 28:41: And thou shalt put them upon Aaron thy brother, and his sons with him; and shalt anoint them, and consecrate them, and sanctify them, that they may minister unto me in the priest's office. [consecrate...: Heb. fill their hand]
Contradiction with Exodus 29:4
Contradiction lies in the redundancy, as Exodus 29:4 already commands Moses to wash Aaron and his sons, making the same directive in Exodus 40:12 seemingly repetitive.
Exodus 29:4: And Aaron and his sons thou shalt bring unto the door of the tabernacle of the congregation, and shalt wash them with water.
Contradiction with Exodus 30:19-21
Contradiction appears as it says Aaron and his sons must wash their hands and feet whenever they enter the tent of meeting, whereas Exodus 40:12 requires a broader washing of their entire body.
Exodus 30:19-21: For Aaron and his sons shall wash their hands and their feet thereat:
Contradiction with Leviticus 16:4
Contradiction exists in the particulars of washing and garments since Leviticus 16:4 specifies bathing and wearing holy garments before entering the holy place, focusing on the Day of Atonement, differing from the establishment of regular washing in Exodus 40:12.
Leviticus 16:4: He shall put on the holy linen coat, and he shall have the linen breeches upon his flesh, and shall be girded with a linen girdle, and with the linen mitre shall he be attired: these [are] holy garments; therefore shall he wash his flesh in water, and [so] put them on.
Contradiction with Numbers 6:20
Contradictory in purpose as it involves the Nazirite vow process where a different type of offering and ritual is being performed, unrelated to consecration for priestly service like in Exodus 40:12.
Numbers 6:20: And the priest shall wave them [for] a wave offering before the LORD: this [is] holy for the priest, with the wave breast and heave shoulder: and after that the Nazarite may drink wine.