You unleash your mouth for evil

Romans 3:13-14
“Their throats are open graves; their tongues practice deceit.” “The venom of vipers is on their lips.” / “Their mouths are full of cursing and bitterness.”

Proverbs 15:28
The heart of the righteous ponders how to answer, but the mouth of the wicked blurts out evil.

James 3:6
The tongue also is a fire, a world of wickedness among the parts of the body. It pollutes the whole person, sets the course of his life on fire, and is itself set on fire by hell.

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and harness your tongue to deceit.

Jeremiah 9:3-5
“They bend their tongues like bows; lies prevail over truth in the land. For they proceed from evil to evil, and they do not take Me into account,” declares the LORD. / “Let everyone guard against his neighbor; do not trust any brother, for every brother deals craftily, and every friend spreads slander. / Each one betrays his friend; no one tells the truth. They have taught their tongues to lie; they wear themselves out committing iniquity.

Psalm 52:2
Your tongue devises destruction like a sharpened razor, O worker of deceit.

Proverbs 26:24-28
A hateful man disguises himself with his speech, but he lays up deceit in his heart. / When he speaks graciously, do not believe him, for seven abominations fill his heart. / Though his hatred is concealed by deception, his wickedness will be exposed in the assembly. …

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Proverbs 10:31-32
The mouth of the righteous brings forth wisdom, but a perverse tongue will be cut out. / The lips of the righteous know what is fitting, but the mouth of the wicked is perverse.

Matthew 12:34-37
You brood of vipers, how can you who are evil say anything good? For out of the overflow of the heart the mouth speaks. / The good man brings good things out of his good store of treasure, and the evil man brings evil things out of his evil store of treasure. / But I tell you that men will give an account on the day of judgment for every careless word they have spoken. …

Ephesians 4:29
Let no unwholesome talk come out of your mouths, but only what is helpful for building up the one in need and bringing grace to those who listen.

Proverbs 15:2
The tongue of the wise commends knowledge, but the mouth of the fool spouts folly.

Colossians 3:8
But now you must put aside all such things as these: anger, rage, malice, slander, and filthy language from your lips.

Proverbs 6:12-14
A worthless person, a wicked man, walks with a perverse mouth, / winking his eyes, speaking with his feet, and pointing with his fingers. / With deceit in his heart he devises evil; he continually sows discord.

Proverbs 12:18
Speaking rashly is like a piercing sword, but the tongue of the wise brings healing.

1 Peter 3:10
For, “Whoever would love life and see good days must keep his tongue from evil and his lips from deceitful speech.

Proverbs 26:28
A lying tongue hates those it crushes, and a flattering mouth causes ruin.

James 1:26
If anyone considers himself religious and yet does not bridle his tongue, he deceives his heart and his religion is worthless.