Revelation 8

  ¹⁰ And the third angel sounded, 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 the waters;

 ¹¹ and the name of the star is called Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter.