Idle Words

A good man out of the good treasure of the heart bringeth forth good things: and an evil man out of the evil treasure bringeth forth evil things. But I say unto you, That every idle word that men shall speak, they shall give account thereof in the day of judgment. For by thy words thou shalt be justified, and by thy words thou shalt be condemned.
Matthew 12:35-37

Idle words are the breath of corruption and the vomit of spiritual cowardice.

The idle speaker of idle things cares not that while his mouth boasts in his mighty thoughts, he is yet heaping up judgement according to what he has DONE. The more a man speaks, the more he ought also to fear. For in being measured by the Holy; every failure of true obedience shall be counted infinitely against every word spoken in idleness.

The humble obey the Lord, therefore are they justified in their speech; but the proud find no pleasure in walking righteously, therefore are they condemned by the greatest of their own words.

The tongue of the idle wags insatiably; but where the Spirit of God finds rest, there broods His wisdom. How deflated shall be the empty wineskins, when at last their breath is taken from them!

Thou art snared with the words of thy mouth, thou art taken with the words of thy mouth.
Proverbs 6:2

In the multitude of words there wanteth not sin: but he that refraineth his lips is wise.
Proverbs 10:19

The words of the wicked are to lie in wait for blood: but the mouth of the upright shall deliver them.
Proverbs 12:6

The thoughts of the wicked are an abomination to the LORD: but the words of the pure are pleasant words.
Proverbs 15:26

He that hath knowledge spareth his words: and a man of understanding is of an excellent spirit.
Proverbs 17:27

Seest thou a man that is hasty in his words? there is more hope of a fool than of him.
Proverbs 29:20