Contradiction with Exodus 12:15
Exodus 12:15 emphasizes the immediate and strict observance of the Feast of Unleavened Bread starting from the first month without provision for a delayed observance, contrasting with Numbers 9:11's allowance for delay.
Exodus 12:15: Seven days shall ye eat unleavened bread; even the first day ye shall put away leaven out of your houses: for whosoever eateth leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.
Contradiction with Leviticus 23:5
Leviticus 23:5 establishes the Passover on the fourteenth day of the first month without mention of an alternative option for observing it later, indicating a stricter timing compared to Numbers 9:11.
Leviticus 23:5: In the fourteenth [day] of the first month at even [is] the LORD'S passover.
Contradiction with Deuteronomy 16:1-2
Deuteronomy 16:1-2 commands the observance of Passover in the first month, with no mention of an alternative second month observance, contrasting the flexibility seen in Numbers 9:11.
Deuteronomy 16:1-2: Observe the month of Abib, and keep the passover unto the LORD thy God: for in the month of Abib the LORD thy God brought thee forth out of Egypt by night.