Romans 12:14
Ask God's blessing on people who persecute you, instead of cursing them.
Matthew 5:22
But I say to you that every person who is angry toward his brother will be subject to judgment; and whoever calls his brother 'stupid idiot' is subject to [being sentenced by] the [Jewish] Council, and whoever says, 'go to hell' is subject to going to the fire of hell [himself].
Matthew 5:43-44
"You have heard what was said [Lev. 19:18], 'You must love your neighbor and hate your enemy.'
Matthew 12:36
And I say to you, a person will [have to] give an account [to God] on the day of judgment for every careless word he had spoken [while on earth].
James 3:6
And the tongue is [like] a fire [i.e., like that spark]. [For] the tongue, as a part of the body, is [like] the world of evil. It corrupts the entire life [of a person] and inflames the course of nature itself [i.e., it affects a person throughout his whole earthly existence], and is ignited by hell itself [i.e., the evil produced by the fiery tongue has hell as its source and destiny].
James 3:9-10
We praise the Lord and Father with it, and [also] curse men who are created in God's likeness with it.
1 Peter 2:22-23
[For] He neither sinned nor used deceitful words.
1 Peter 3:9
Do not repay a wrong action with [another] wrong action, nor abusive [language] with [additional] abuse, but rather be a blessing [to one another]. For the purpose of your being called [by God] was so that you could receive a blessing [from Him eventually].