Verses with the word mourning in the New Testament (4 verses):

Matthew 2:18
In Rama was there a voice heard, lamentation, and weeping, and great mourning, Rachel weeping for her children, and would not be comforted, because they are not.

2 Corinthians 7:7
And not by his coming only, but by the consolation wherewith he was comforted in you, when he told us your earnest desire, your mourning, your fervent mind toward me; so that I rejoiced the more.

James 4:9
Be afflicted, and mourn, and weep: let your laughter be turned to mourning, and your joy to heaviness.

Revelation 18:8
Therefore shall her plagues come in one day, death, and mourning, and famine; and she shall be utterly burned with fire: for strong is the Lord God who judgeth her.