Contradiction with Ecclesiastes 7:2
Contradicts the idea of making great mirth, instead advising that it is better to go to a house of mourning.
Ecclesiastes 7:2: [It is] better to go to the house of mourning, than to go to the house of feasting: for that [is] the end of all men; and the living will lay [it] to his heart.
Contradiction with Matthew 5:4
Contradicts the joyfulness by teaching that those who mourn are blessed and shall be comforted.
Matthew 5:4: Blessed [are] they that mourn: for they shall be comforted.
Contradiction with James 4:9
Advises turning laughter to mourning and joy to heaviness, contrasting the communal joy in Nehemiah 8:12.
James 4:9: Be afflicted, and mourn, and weep: let your laughter be turned to mourning, and [your] joy to heaviness.