Hisgalus 7:2

And I saw another malach (angel) coming up from the rising of the shemesh (sun), having a chotam (seal) of the Elohim Chayyim (Living G-d), and he cried with a kol gadol (loud voice) to the four malachim (angels). These were the malachim to whom it was given to harm ha'aretz (the earth) and hayam (the sea)