Revelation 9:1, 3, 5

Then the fifth angel blew his trumpet, and I saw a star that had fallen to earth from the sky, and he was given the key to the shaft of the bottomless pit.

Then locusts came from the smoke and descended on the earth, and they were given power to sting like scorpions.

They were told not to kill them but to torture them for five months with pain like the pain of a scorpion sting.