'Mourners' in the Bible

I chose the way for them and sat as their chief; I lived like a king among his troops; I was like one who comforts mourners.

and they are afraid of heights and the dangers in the street; the almond blossoms grow white, and the grasshopper drags itself along, and the caper berry shrivels up -- because man goes to his eternal home, and the mourners go about in the streets --

Because of Israel's sins this is what the Lord, the God who commands armies, the sovereign One, says: "In all the squares there will be wailing, in all the streets they will mourn the dead. They will tell the field workers to lament and the professional mourners to wail.

You have said, 'It is useless to serve God. How have we been helped by keeping his requirements and going about like mourners before the Lord who rules over all?