James 3:10

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

Romans 12:14

Bless those who persecute you; bless, and curse not.

1 Corinthians 3:3

for ye are yet unspiritual. For while there is among you rivalry and strife, are ye not unspiritual, and walking after the manner of men?

1 Timothy 5:13

and withal they learn to be idle, going about from house to house; and not only idle, but tattlers also, and busybodies, speaking things which they ought not.

1 Peter 3:9

not rendering evil for evil, or railing for railing; but, on the contrary, blessing the evildoer; because for this end ye were called, that ye 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 those who persecute you; bless, and curse not.
1 Peter 3:9
not rendering evil for evil, or railing for railing; but, on the contrary, blessing the evildoer; because for this end ye were called, that ye might inherit blessing.

These

1 Corinthians 3:3
for ye are yet unspiritual. For while there is among you rivalry and strife, are ye not unspiritual, and walking after the manner of men?
1 Timothy 5:13
and withal they learn to be idle, going about from house to house; and not only idle, but tattlers also, and busybodies, speaking things which they ought not.

General references

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