mighty works = powers. Greek. Plural of dunamis. See App-172.
been done = taken place.
repented. See App-111.
sackcloth. Greek. sakkos, from Rob. sak = sacking. A coarsely woven material used for sieves and strainers (worn next the skin in mourning), Isa_3:24. Job_16:15. 1Ki_21:27. 2Ki_6:30; not laid aside at night, 1Ki_21:27. Joe_1:13. Compare Isa_20:2, &c.
ashes. Also a sign of mourning. See 1Sa_4:12. 2Sa_1:2; 2Sa_13:19. Job_2:12. Eze_27:30, &c