Contradiction with Esther 9:22
Nehemiah 9:3 describes a time of fasting and confession, whereas Esther 9:22 talks about feasting and joy.
Esther 9:22: As the days wherein the Jews rested from their enemies, and the month which was turned unto them from sorrow to joy, and from mourning into a good day: that they should make them days of feasting and joy, and of sending portions one to another, and gifts to the poor.
Contradiction with Ecclesiastes 3:4
Nehemiah 9:3 focuses on mourning and repentance, while Ecclesiastes 3:4 mentions a time to laugh and dance.
Ecclesiastes 3:4: A time to weep, and a time to laugh; a time to mourn, and a time to dance;
Contradiction with Matthew 6:16
Nehemiah 9:3 highlights communal confession and fasting, whereas Matthew 6:16 advises fasting in a private manner.
Matthew 6:16: Moreover when ye fast, be not, as the hypocrites, of a sad countenance: for they disfigure their faces, that they may appear unto men to fast. Verily I say unto you, They have their reward.
Contradiction with Isaiah 58:5
Nehemiah 9:3 implies a sincere fast and confession, yet Isaiah 58:5 criticizes an empty or superficial fast.
Isaiah 58:5: Is it such a fast that I have chosen? a day for a man to afflict his soul? [is it] to bow down his head as a bulrush, and to spread sackcloth and ashes [under him]? wilt thou call this a fast, and an acceptable day to the LORD? [a day...: or, to afflict his soul for a day?]
Contradiction with Luke 18:12
Nehemiah 9:3 involves collective fasting and seeking God, while Luke 18:12 showcases boasting about fasting as a sign of self-righteousness.
Luke 18:12: I fast twice in the week, I give tithes of all that I possess.