'Gashes' in the Bible

Indeed every head will be bald and every beard cut short. There will be gashes on all the hands and sackcloth on the loins.

Wail, you people in Heshbon, because Ai in Ammon is destroyed. Cry out in anguish, you people in the villages surrounding Rabbah. Put on sackcloth and cry out in mourning. Run about covered with gashes. For your god Milcom will go into exile along with his priests and officials.