Contradiction with Matthew 6:16
This verse advises against showing outward signs of fasting, which contradicts Daniel's open 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 Ecclesiastes 3:4
This verse mentions a time to mourn and a time to dance, suggesting appropriateness according to time, possibly contrasting with Daniel's choice during his vision.
Ecclesiastes 3:4: A time to weep, and a time to laugh; a time to mourn, and a time to dance;
Contradiction with Isaiah 61:3
This verse speaks about replacing mourning with joy, which may contrast with Daniel continuing in mourning.
Isaiah 61:3: To appoint unto them that mourn in Zion, to give unto them beauty for ashes, the oil of joy for mourning, the garment of praise for the spirit of heaviness; that they might be called trees of righteousness, the planting of the LORD, that he might be glorified.
Contradiction with John 16:20
The contrast here is between the world's joy during mourning, suggesting that mourning is not productive, unlike Daniel's prolonged time of mourning.
John 16:20: Verily, verily, I say unto you, That ye shall weep and lament, but the world shall rejoice: and ye shall be sorrowful, but your sorrow shall be turned into joy.