2 Samuel 3:31

3:31 David instructed Joab and all the people who were with him, “Tear your clothes! Put on sackcloth! Lament before Abner!” Now King David followed behind the funeral bier.

2 Samuel 3:2

3:2 Now sons were born to David in Hebron. His firstborn was Amnon, born to Ahinoam the Jezreelite.

2 Samuel 6:1

David Brings the Ark to Jerusalem

6:1 David again assembled all the best men in Israel, thirty thousand in number.

Jonah 3:6-8

3:6 When the news reached the king of Nineveh, he got up from his throne, took off his royal robe, put on sackcloth, and sat on ashes. 3:7 He issued a proclamation and said, “In Nineveh, by the decree of the king and his nobles: No human or animal, cattle or sheep, is to taste anything; they must not eat and they must not drink water. 3:8 Every person and animal must put on sackcloth and must cry earnestly to God, and everyone must turn from their evil way of living and from the violence that they do.

Matthew 11:21

11:21 “Woe to you, Chorazin! Woe to you, Bethsaida! If the miracles done in you had been done in Tyre and Sidon, they would have repented long ago in sackcloth and ashes.