'Mourners' in the Bible

I chose out their way, and sat as chief. I lived as a king in the army, as one who comforts the mourners.

yes, they shall be afraid of heights, and terrors will be in the way; and the almond tree shall blossom, and the grasshopper shall be a burden, and desire shall fail; because man goes 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 to him and to his mourners.

They won't pour out wine offerings to Yahweh, neither will they be pleasing to him. Their sacrifices will be to them like the bread of mourners; all who eat of it will be polluted; for their bread will be for their appetite. It will not come into the house of Yahweh.