Contradiction with Proverbs 12:22
While Numbers 14:36 describes how spreading negative reports led to consequences, Proverbs 12:22 praises truthfulness, which can be seen as contradicting the act of spreading false reports.
Proverbs 12:22: Lying lips [are] abomination to the LORD: but they that deal truly [are] his delight.
Contradiction with James 3:10
Numbers 14:36 speaks of spreading evil reports, whereas James 3:10 highlights the contradiction of using the tongue for both blessing and cursing.
James 3:10: Out of the same mouth proceedeth blessing and cursing. My brethren, these things ought not so to be.
Contradiction with Philippians 4:8
Numbers 14:36 focuses on negative reports, while Philippians 4:8 encourages meditating on things that are true and noble.
Philippians 4:8: Finally, brethren, whatsoever things are true, whatsoever things [are] honest, whatsoever things [are] just, whatsoever things [are] pure, whatsoever things [are] lovely, whatsoever things [are] of good report; if [there be] any virtue, and if [there be] any praise, think on these things. [honest: or, venerable]
Contradiction with Ephesians 4:29
Numbers 14:36 deals with spreading harmful reports, but Ephesians 4:29 advises speaking only what is helpful for building others up.
Ephesians 4:29: Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers. [to...: or, to edify profitably]
Contradiction with Titus 3:2
The negative report in Numbers 14:36 contrasts with Titus 3:2, which advises speaking evil of no one and being peaceable.
Titus 3:2: To speak evil of no man, to be no brawlers, [but] gentle, shewing all meekness unto all men.
Contradiction with 1 Peter 3:10
Numbers 14:36 reflects harmful speech consequences, unlike 1 Peter 3:10, which shows a desire to speak no guile.
1 Peter 3:10: For he that will love life, and see good days, let him refrain his tongue from evil, and his lips that they speak no guile: