Revelation 8:11

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.

Hebrews 12:15

carefully observing lest any of you fail of attaining the grace of God; lest any root of bitterness springing up trouble you, and by it many be defiled;

Revelation 8:7

And the first angel blew the trumpet, and there were hail and fire mingled with blood, and they were cast on the earth; and a third part of the trees was burnt up, and all green grass was burnt up.

Treasury of Scripture Knowledge

Summary

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.

Wormwood

Bible References

Wormwood

Hebrews 12:15
carefully observing lest any of you fail of attaining the grace of God; lest any root of bitterness springing up trouble you, and by it many be defiled;