Romans 12:14
bless them that persecute you; bless, and curse not;
Matthew 5:22
But I say to you, Whoever is angry with his brother without a cause, shall be liable to the sentence of the judges. And whoever shall say to his brother, Worthless fellow, shall be liable to the sentence of the Sanhedrin. But who ever shall say, Impious wretch, shall be in danger of hell-fire.
Matthew 5:43-44
You have heard that it was said: You shall love your neighbor, and hate your enemy.
Matthew 12:36
But I say to you, That for every idle word which men speak, they shall give account in the day of judgment.
James 3:6
And the tongue is a fire, the world of iniquity. So is the tongue placed among our members, defiling the whole body, setting on fire the course of life, and being set on fire by hell.
James 3:9-10
With it we bless God, even the Father: and with it we curse men, who are made in the likeness of God.
1 Peter 2:22-23
He did no sin, nor was guile found in his mouth.
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.