Contradiction with Matthew 5:44
While Psalms 140:11 speaks of wishing misfortune on evil speakers, Matthew 5:44 teaches to love your enemies and pray for those who persecute you, which contradicts the idea of wishing harm.
Matthew 5:44: But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
Contradiction with Romans 12:20
Psalms 140:11 calls for a downfall of the slanderous, whereas Romans 12:20 instructs believers to feed their enemies and show them kindness.
Romans 12:20: Therefore if thine enemy hunger, feed him; if he thirst, give him drink: for in so doing thou shalt heap coals of fire on his head.
Contradiction with Proverbs 25:21-22
This verse encourages showing kindness to one's enemy, contradicting the desire for calamity in Psalms 140:11.
Proverbs 25:21-22: If thine enemy be hungry, give him bread to eat; and if he be thirsty, give him water to drink:
Contradiction with Luke 6:27
Psalms 140:11 implies a desire for evil to befall the wicked, while Luke 6:27 instructs to do good to those who hate you.
Luke 6:27: But I say unto you which hear, Love your enemies, do good to them which hate you,
Contradiction with Ephesians 4:32
The call for compassion and forgiveness in Ephesians 4:32 opposes the sentiment in Psalms 140:11 to seek downfall for malicious speakers.
Ephesians 4:32: And be ye kind one to another, tenderhearted, forgiving one another, even as God for Christ's sake hath forgiven you.