Contradiction with Exodus 20:12
Ezekiel 24:20 involves the death of Ezekiel's wife, which is not mourned publicly, contradicting the commandment to honor one's parents and by extension family, usually involving mourning.
Exodus 20:12: Honour thy father and thy mother: that thy days may be long upon the land which the LORD thy God giveth thee.
Contradiction with Matthew 5:4
Ezekiel 24:20 emphasizes not mourning, which contradicts the Beatitude that blessed are those who mourn, where comfort is promised.
Matthew 5:4: Blessed [are] they that mourn: for they shall be comforted.
Contradiction with Romans 12:15
Encourages believers to weep with those who weep, contradicting Ezekiel 24:20 where mourning is explicitly forbidden.
Romans 12:15: Rejoice with them that do rejoice, and weep with them that weep.
Contradiction with 1 Thessalonians 4:13
Advises not to grieve like others who have no hope, hinting some level of mourning is acceptable, contrasting the complete abstinence in Ezekiel 24:20.
1 Thessalonians 4:13: But I would not have you to be ignorant, brethren, concerning them which are asleep, that ye sorrow not, even as others which have no hope.