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

Matthew 11:17
And saying, We have piped unto you, and ye have not danced; we have mourned unto you, and ye have not lamented.

Mark 16:10
And she went and told them that had been with him, as they mourned and wept.

Luke 7:32
They are like unto children sitting in the marketplace, and calling one to another, and saying, We have piped unto you, and ye have not danced; we have mourned to you, and ye have not wept.

1 Corinthians 5:2
And ye are puffed up, and have not rather mourned, that he that hath done this deed might be taken away from among you.