'Mourners' in the Bible

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

Also when they shall be afraid of that which is high, and fears shall be in the way, and the almond tree shall flourish, and the grasshopper shall be a burden, and desire shall fail: because man goeth to his long 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 offer wine offerings to the LORD, 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 for their soul shall not come into the house of the LORD.