'Mourning' in the Bible

The king composed this mourning song for Abner: "Should Abner's death be like a fool's?

When Uriah's wife heard about the death of her husband Uriah, she went into mourning for the head of her household.

When her mourning period was completed, David sent for her, brought her to his palace, and she became his wife. Later on, she bore him a son.

so he sent messengers to Tekoa to bring a wise woman from there. He told her, "Please play the role of a mourner, wear the clothes of a mourner, and refrain from using makeup. Act like a woman who's been in mourning for the dead for many days.

Someone informed Joab, "The king is weeping bitterly, mourning for Absalom."