'Mourning' in the Bible

At that time the sovereign master, the Lord who commands armies, called for weeping and mourning, for shaved heads and sackcloth.

This is what the Lord says, your protector, the Holy One of Israel: "For your sake I send to Babylon and make them all fugitives, turning the Babylonians' joyful shouts into mourning songs.

to strengthen those who mourn in Zion, by giving them a turban, instead of ashes, oil symbolizing joy, instead of mourning, a garment symbolizing praise, instead of discouragement. They will be called oaks of righteousness, trees planted by the Lord to reveal his splendor.