Revelation 8:11

And the name of the star is called Wormwood, and many men died of the waters, because they were bitter.

Hebrews 12:15

Looking diligently, lest any one fall from the grace of God, lest any root of bitterness springing up trouble you, and thereby many be defiled: Lest there be any fornicator or profane person,

Revelation 8:7

And the first sounded, and there was hail, and fire mingled with blood, and they were cast upon the earth: and the third part of the earth was burnt up, and the third part of the trees was burnt up, and all the 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
Looking diligently, lest any one fall from the grace of God, lest any root of bitterness springing up trouble you, and thereby many be defiled: Lest there be any fornicator or profane person,