James 3:10

Out of the same mouth proceeds a blessing and a curse. My brothers, these things ought not so to be.

Romans 12:14

Bless those that persecute, bless and curse not.

1 Corinthians 3:3

for you are yet carnal. For when there is envy and strife among you are you not carnal and walk as men?

1 Timothy 5:13

and at the same time also, being idle, they learn to go from house to house, and not only are they idle, they are also tattlers and mischief makers, saying what they ought not.

1 Peter 3:9

not returning evil for evil or railing for railing, but on the contrary blessing [your enemies], because to this you are called, that you may inherit 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 those that persecute, bless and curse not.
1 Peter 3:9
not returning evil for evil or railing for railing, but on the contrary blessing [your enemies], because to this you are called, that you may inherit blessing.

These

1 Corinthians 3:3
for you are yet carnal. For when there is envy and strife among you are you not carnal and walk as men?
1 Timothy 5:13
and at the same time also, being idle, they learn to go from house to house, and not only are they idle, they are also tattlers and mischief makers, saying what they ought not.

General references

Matthew 15:18
But the things which proceed from the mouth come from the heart, and these defile the man.
Romans 3:14
Their mouth is full of cursing and bitterness.
Romans 12:14
Bless those that persecute, bless and curse not.