Contradiction with Matthew 6:6
Esther 4:17 involves a public call for fasting and prayer, while Matthew 6:6 emphasizes praying in private.
Matthew 6:6: But thou, when thou prayest, enter into thy closet, and when thou hast shut thy door, pray to thy Father which is in secret; and thy Father which seeth in secret shall reward thee openly.
Contradiction with 1 Thessalonians 5:16
Esther 4:17 involves mourning and fasting, while 1 Thessalonians 5:16 encourages constant rejoicing.
1 Thessalonians 5:16: Rejoice evermore.
Contradiction with Philippians 4:6
Esther 4:17 focuses on fasting and distress, whereas Philippians 4:6 advises against anxiety and encourages presenting requests to God with thanksgiving.
Philippians 4:6: Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God.