Contradiction with Leviticus 23:37
Numbers 29:21 mentions a specific offering on the seventh day of the Feast of Tabernacles, while Leviticus 23:37 provides a general command for offerings without specificity to days.
Leviticus 23:37: These [are] the feasts of the LORD, which ye shall proclaim [to be] holy convocations, to offer an offering made by fire unto the LORD, a burnt offering, and a meat offering, a sacrifice, and drink offerings, every thing upon his day:
Contradiction with Hebrews 10:4
Numbers 29:21 prescribes specific animal sacrifices, but Hebrews 10:4 expresses that it is impossible for these sacrifices to take away sins.
Hebrews 10:4: For [it is] not possible that the blood of bulls and of goats should take away sins.
Contradiction with Isaiah 1:11
Numbers 29:21 describes the required offerings, yet Isaiah 1:11 questions the value of multitude sacrifices, contradicting the requirement and necessity of them.
Isaiah 1:11: To what purpose [is] the multitude of your sacrifices unto me? saith the LORD: I am full of the burnt offerings of rams, and the fat of fed beasts; and I delight not in the blood of bullocks, or of lambs, or of he goats. [he goats: Heb. great he goats]
Contradiction with 1 Samuel 15:22
Numbers 29:21 focuses on ritual sacrifices, whereas 1 Samuel 15:22 emphasizes obedience over sacrifice.
1 Samuel 15:22: And Samuel said, Hath the LORD [as great] delight in burnt offerings and sacrifices, as in obeying the voice of the LORD? Behold, to obey [is] better than sacrifice, [and] to hearken than the fat of rams.