Contradiction with Matthew 5:44
This verse instructs to love your enemies and pray for those who persecute you, whereas Psalms 71:4 asks for deliverance from the hand of oppressors.
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 12:19
This verse advises against seeking personal vengeance and to leave it to God's wrath, while Psalms 71:4 calls for deliverance from wicked oppressors.
Romans 12:19: Dearly beloved, avenge not yourselves, but [rather] give place unto wrath: for it is written, Vengeance [is] mine; I will repay, saith the Lord.
Contradiction with Proverbs 25:21
This verse encourages you to feed your enemy if they are hungry, contradicting Psalms 71:4's desire for rescue from enemies.
Proverbs 25:21: If thine enemy be hungry, give him bread to eat; and if he be thirsty, give him water to drink: