Romans 12:14
Bless those who make a practice of persecuting you; bless them instead of cursing them.
Matthew 5:22
whoever maligns his brother must come before the San hedrin, whoever curses his brother must go to the fire of Gehenna.' But I tell you, whoever is angry with his brother [without cause] will be sentenced by God.
Matthew 5:43-44
You have heard the saying, 'You must love your neighbour and hate your enemy.'
Matthew 12:36
I tell you, men will have to account on the day of judgment for every light word they utter;
James 3:6
And the tongue is a fire, the tongue proves a very world of mischief among our members, staining the whole of the body and setting fire to the round circle of existence with a flame fed by hell.
James 3:9-10
With the tongue we bless the Lord and Father, and with the tongue we curse men made in God's likeness;
1 Peter 2:22-23
He committed no sin, no guile was ever found upon his lips;
1 Peter 3:9
never paying back evil for evil, never reviling when you are reviled, but on the contrary blessing. For this is your vocation, to bless and to inherit blessing;