James 3:10

Out of the same mouth come forth blessing and cursing. These things, my brethren, ought not so to be.

Romans 12:14

bless them that persecute you; bless, and curse not;

1 Corinthians 3:3

for you are yet carnal. For, since envy and strife and divisions are among you, are you not carnal, and do you not walk as men?

1 Timothy 5:13

At the same time, also, they learn to be idle, wandering about from house to house; and not only idle, but tattlers also, and busybodies, speaking things which are not proper.

1 Peter 3:9

not repaying evil for evil, nor reviling for reviling, but, on the other hand, blessing, since you know that for this end you were called, that you might 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 them that persecute you; bless, and curse not;
1 Peter 3:9
not repaying evil for evil, nor reviling for reviling, but, on the other hand, blessing, since you know that for this end you were called, that you might inherit blessing.

These

1 Corinthians 3:3
for you are yet carnal. For, since envy and strife and divisions are among you, are you not carnal, and do you not walk as men?
1 Timothy 5:13
At the same time, also, they learn to be idle, wandering about from house to house; and not only idle, but tattlers also, and busybodies, speaking things which are not proper.

General references

Matthew 15:18
But those things which go out 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 them that persecute you; bless, and curse not;