Revelation 8:10-11 - The Third Trumpet
10 And the third angel blew the trumpet, and there fell from heaven a great star, burning as a torch, and it fell upon the third part of the rivers, and upon the fountains of water; 11 and the name of the star is called Wormwood: and the third part of the waters was turned into wormwood, and multitudes of men died of the waters, because they were made bitter.