Acts 8:23

For I see you are a bitter poison and a pack of evil."

Romans 1:31

devoid of conscience, false to their word, callous, merciless;

2 Timothy 3:3

callous, relentless, scurrilous, dissolute, and savage; they will hate goodness,

Hebrews 12:15

see to it that no one misses the grace of God, that no root of bitterness grows up to be a trouble by contaminating all the rest of you;

Revelation 8:10-11

The third angel blew, and a huge star blazing like a torch dropped out of the sky, dropped on a third of the rivers and on the fountains

Treasury of Scripture Knowledge

Summary

They have spoken words, swearing falsely in making a covenant: thus judgment springeth up as hemlock in the furrows of the field.

Bible References

Swearing

Romans 1:31
devoid of conscience, false to their word, callous, merciless;
2 Timothy 3:3
callous, relentless, scurrilous, dissolute, and savage; they will hate goodness,

Thus

Acts 8:23
For I see you are a bitter poison and a pack of evil."
Hebrews 12:15
see to it that no one misses the grace of God, that no root of bitterness grows up to be a trouble by contaminating all the rest of you;
Revelation 8:10
The third angel blew, and a huge star blazing like a torch dropped out of the sky, dropped on a third of the rivers and on the fountains