'Mourning' in the Bible

You have turned for me my mourning into dancing;You have loosed my sackcloth and girded me with gladness,

I went about as though it were my friend or brother;I bowed down mourning, as one who sorrows for a mother.

I am bent over and greatly bowed down;I go mourning all day long.

I will say to God my rock, “Why have You forgotten me?Why do I go mourning because of the oppression of the enemy?”

For You are the God of my strength; why have You rejected me?Why do I go mourning because of the oppression of the enemy?