Revelation 8
10 Ref And at the sounding of the third angel, there went down from heaven a great star, burning like a flame, and it came on a third part of the rivers, and on the fountains of water.
11 Ref And the name of the star is Wormwood: and a third part of the waters became bitter; and a number of men came to their end because of the waters, for they were made bitter.