Contradiction with Deuteronomy 1:26
This verse shows the Israelites refusing to go up and take the land, which contrasts with Numbers 14:6, where Joshua and Caleb encourage taking the land.
Deuteronomy 1:26: Notwithstanding ye would not go up, but rebelled against the commandment of the LORD your God:
Contradiction with Numbers 13:31
Here, the spies report that they are not able to go up against the people of the land, in contrast to Numbers 14:6, where Joshua and Caleb are confident.
Numbers 13:31: But the men that went up with him said, We be not able to go up against the people; for they [are] stronger than we.
Contradiction with Psalm 106:24
The Israelites despise the promised land, opposite to Numbers 14:6 where Joshua and Caleb affirm its goodness.
Psalm 106:24: Yea, they despised the pleasant land, they believed not his word: [the pleasant...: Heb. a land of desire]
Contradiction with Hebrews 3:18-19
These verses indicate disbelief as the reason the Israelites did not enter the land, while Numbers 14:6 shows belief and encouragement from Joshua and Caleb.
Hebrews 3:18-19: And to whom sware he that they should not enter into his rest, but to them that believed not?