'Mourners' in the Bible

I chose out their way, and sat as chief, And dwelt as a king in the army, As one that comforteth the mourners.

yea, they shall be afraid of that which is high, and terrors'shall be in the way; and the almond-tree shall blossom, and the grasshopper shall be a burden, and desire shall fail; because man goeth to his everlasting home, and the mourners go about the streets:

I have seen his ways, and will heal him: I will lead him also, and restore comforts unto him and to his mourners.

They shall not pour out wine-offerings to Jehovah, neither shall they be pleasing unto him: their sacrifices shall be unto them as the bread of mourners; all that eat thereof shall be polluted; for their bread shall be for their appetite; it shall not come into the house of Jehovah.