Contradiction with Exodus 20:13
Esther 9:20 celebrates the victory and survival of the Jews over their enemies, leading to their enemies' deaths, which seems to contradict the commandment "Thou shalt not kill."
Exodus 20:13: Thou shalt not kill.
Contradiction with Matthew 5:44
Esther 9:20 involves conflict and triumph over enemies, whereas this verse teaches to love your enemies and pray for those who persecute you.
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
Esther 9:20 is about the Jews taking action against their enemies, while this verse advises believers to leave vengeance to God and not repay evil for evil.
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 24:17
The celebration in Esther 9:20 may suggest rejoicing over the downfall of enemies, which this verse warns against, advising not to rejoice when an enemy falls.
Proverbs 24:17: Rejoice not when thine enemy falleth, and let not thine heart be glad when he stumbleth:
Contradiction with 1 Peter 3:9
Esther 9:20 is about the celebration of a military victory, whereas this verse encourages Christians not to return evil for evil or insult for insult, but to give a blessing instead.
1 Peter 3:9: Not rendering evil for evil, or railing for railing: but contrariwise blessing; knowing that ye are thereunto called, that ye should inherit a blessing.