Contradiction with 1 Thessalonians 5:16
While Esther 4:3 describes mourning, 1 Thessalonians 5:16 calls for rejoicing evermore.
1 Thessalonians 5:16: Rejoice evermore.
Contradiction with Philippians 4:4
Esther 4:3 is about lamentation, but Philippians 4:4 instructs believers to always rejoice in the Lord.
Philippians 4:4: Rejoice in the Lord alway: [and] again I say, Rejoice.
Contradiction with James 1:2
Esther 4:3 shows sorrow, James 1:2 encourages considering trials as joy.
James 1:2: My brethren, count it all joy when ye fall into divers temptations; [temptations: or, trials]
Contradiction with Exodus 14:13-14
Esther 4:3 illustrates distress, whereas Exodus 14:13-14 assures God's deliverance and encourages not to fear.
Exodus 14:13-14: And Moses said unto the people, Fear ye not, stand still, and see the salvation of the LORD, which he will shew to you to day: for the Egyptians whom ye have seen to day, ye shall see them again no more for ever. [for the...: or, for whereas ye have seen the Egyptians to day]
Contradiction with Matthew 5:12
Esther 4:3 depicts sadness; Matthew 5:12 urges to rejoice and be glad even in persecution.
Matthew 5:12: Rejoice, and be exceeding glad: for great [is] your reward in heaven: for so persecuted they the prophets which were before you.