James 3:10

Blessing and cursing issue from the same mouth! This is not right, my brothers.

Romans 12:14

Bless your persecutors; bless them; do not curse them.

1 Corinthians 3:3

for you are still worldly. For when there are still jealousy and quarrels among you, are you not worldly and living on a merely human level?

1 Timothy 5:13

Besides, as they go about from house to house they learn to be idle, and not only idle but gossips and busybodies, and talk of things they ought not to mention.

1 Peter 3:9

not returning evil for evil, or abuse for abuse. You must bless people instead. It is for this that you were called??o obtain blessing.

Treasury of Scripture Knowledge

Summary

Out of the same mouth proceedeth blessing and cursing. My brethren, these things ought not so to be.

Bible References

Of

Romans 12:14
Bless your persecutors; bless them; do not curse them.
1 Peter 3:9
not returning evil for evil, or abuse for abuse. You must bless people instead. It is for this that you were called??o obtain blessing.

These

1 Corinthians 3:3
for you are still worldly. For when there are still jealousy and quarrels among you, are you not worldly and living on a merely human level?
1 Timothy 5:13
Besides, as they go about from house to house they learn to be idle, and not only idle but gossips and busybodies, and talk of things they ought not to mention.

General references

Matthew 15:18
But the things that come out of the mouth come from the heart, and they pollute a man.
Romans 3:14
And their mouths are full of bitter curses.
Romans 12:14
Bless your persecutors; bless them; do not curse them.