Contradiction with Matthew 6:16
In this verse, Jesus advises against disfiguring one's face to show others when fasting, in contrast to Nehemiah's public mourning and fasting.
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 Matthew 9:14-15
Jesus explains that his disciples do not fast while he is with them, suggesting a different approach to fasting than Nehemiah's reaction.
Matthew 9:14-15: Then came to him the disciples of John, saying, Why do we and the Pharisees fast oft, but thy disciples fast not?
Contradiction with Ecclesiastes 3:4
This verse speaks of a time to weep and a time to laugh, implying different, possibly conflicting, appropriate responses to situations compared to Nehemiah's immediate weeping and mourning.
Ecclesiastes 3:4: A time to weep, and a time to laugh; a time to mourn, and a time to dance;