Acts 8:23
For I see that you are in the gall of bitterness and in the bond of iniquity."
Romans 1:31
foolish, faithless, heartless, ruthless.
2 Timothy 3:3
unloving, unforgiving, slanderous, without self-control, brutal, haters of good,
Hebrews 12:15
See to it that no one comes short of the grace of God; that no root of bitterness spring up and cause trouble, and by it many become defiled;
Revelation 8:10-11
The third angel sounded his trumpet, and a great star fell from heaven, blazing like a torch, and it fell on a third of the rivers and on the springs of water.