Matthew 15:18
But the things that come out of a person's mouth come from his heart. These are what [spiritually] corrupt a person.
Matthew 12:34
You children of snakes! Since you are evil, how do you expect to speak good things? For the mouth speaks what the heart is filled with.
Matthew 15:11
It is not what enters the mouth of a person that [spiritually] corrupts him, but what proceeds out of his mouth that [spiritually] corrupts him."
James 3:6-10
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].
Luke 19:22
The gentleman replied to him, 'I will judge you [based] on what you [yourself] have [just] said, you evil slave. [Since] you knew that I am a hard man to deal with, picking up [and keeping] something I had not laid down, and harvesting a crop I had not planted,
Revelation 13:5-6
And the beast was given [by the dragon ?] a mouth for making proud claims and [speaking] blasphemous words, and the authority to act for forty-two months [See 11:2; 12:6].