See also Darkness, Physical; Grieve; Humble; Remorse; Sorrow
I make sackcloth covering of heavens, 2 Ne. 7:3 (Isa. 50:3).
people must repent in sackcloth and ashes, Mosiah 11:25.
Nephites repent and humble themselves in sackcloth, Hel. 11:9.
the Lord covers heavens with sackcloth, D&C 133:69.