Contradiction with Leviticus 1:9
While Numbers 6:19 involves the priest taking specific parts of a ram, Leviticus 1:9 describes the burnt offering being washed and wholly burnt, with nothing taken for the priest.
Leviticus 1:9: But his inwards and his legs shall he wash in water: and the priest shall burn all on the altar, [to be] a burnt sacrifice, an offering made by fire, of a sweet savour unto the LORD.
Contradiction with Numbers 18:9
Numbers 6:19 allows the Nazirite to partake in the offering, while Numbers 18:9 stipulates specific offerings as most holy and for priests alone.
Numbers 18:9: This shall be thine of the most holy things, [reserved] from the fire: every oblation of theirs, every meat offering of theirs, and every sin offering of theirs, and every trespass offering of theirs, which they shall render unto me, [shall be] most holy for thee and for thy sons.
Contradiction with Deuteronomy 18:3
Numbers 6:19 involves giving a part of the peace offering to the priest, whereas Deuteronomy 18:3 assigns specific portions of sacrifices to the priests.
Deuteronomy 18:3: And this shall be the priest's due from the people, from them that offer a sacrifice, whether [it be] ox or sheep; and they shall give unto the priest the shoulder, and the two cheeks, and the maw.
Contradiction with 1 Samuel 2:16
In Numbers 6:19, portions are taken after boiling, but 1 Samuel 2:16 notes that priests demanded raw meat, contradicting the boiling process.
1 Samuel 2:16: And [if] any man said unto him, Let them not fail to burn the fat presently, and [then] take [as much] as thy soul desireth; then he would answer him, [Nay]; but thou shalt give [it me] now: and if not, I will take [it] by force. [presently: Heb. as on the day]
Contradiction with Malachi 1:14
Numbers 6:19 includes giving quality portions of the sacrifice, while Malachi 1:14 rebukes those who offer blemished sacrifices instead.
Malachi 1:14: But cursed [be] the deceiver, which hath in his flock a male, and voweth, and sacrificeth unto the Lord a corrupt thing: for I [am] a great King, saith the LORD of hosts, and my name [is] dreadful among the heathen. [which...: Heb. in whose flock is]