James 3:5-6
In the same way, the tongue is a small part of the body, but it boasts of great things. Consider how small a spark sets a great forest ablaze. / 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.

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

Isaiah 10:13-14
For he says: ‘By the strength of my hand I have done this, and by my wisdom, for I am clever. I have removed the boundaries of nations and plundered their treasures; like a mighty one I subdued their rulers. / My hand reached as into a nest to seize the wealth of the nations. Like one gathering abandoned eggs, I gathered all the earth. No wing fluttered, no beak opened or chirped.’”

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. ...

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.”

Isaiah 37:23-24
Whom have you taunted and blasphemed? Against whom have you raised your voice and lifted your eyes in pride? Against the Holy One of Israel! / Through your servants you have taunted the Lord, and you have said: “With my many chariots I have ascended to the heights of the mountains, to the remote peaks of Lebanon. I have cut down its tallest cedars, the finest of its cypresses. I have reached its farthest heights, the densest of its forests.

2 Timothy 3:2-5
For men will be lovers of themselves, lovers of money, boastful, arrogant, abusive, disobedient to their parents, ungrateful, unholy, / unloving, unforgiving, slanderous, without self-control, brutal, without love of good, / traitorous, reckless, conceited, lovers of pleasure rather than lovers of God, ...

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

Isaiah 32:7
The weapons of the scoundrel are destructive; he hatches plots to destroy the poor with lies, even when the plea of the needy is just.

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.

Jeremiah 9:3
“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.

2 Peter 2:18
With lofty but empty words, they appeal to the sensual passions of the flesh and entice those who are just escaping from others who live in error.

Proverbs 18:21
Life and death are in the power of the tongue, and those who love it will eat its fruit.

Isaiah 59:3-4
For your hands are stained with blood, and your fingers with iniquity; your lips have spoken lies, and your tongue mutters injustice. / No one calls for justice; no one pleads his case honestly. They rely on empty pleas; they tell lies; they conceive mischief and give birth to iniquity.

Matthew 23:12
For whoever exalts himself will be humbled, and whoever humbles himself will be exalted.