Other passages to study:
And [Jesus] called the people to him and said to them, “Hear and understand: it is not what goes into the mouth that defiles a person, but what comes out of the mouth; this defiles a person.” -Matthew 15:10-11
For whoever desires to love life and see good days, let him keep his tongue from evil and his lips from speaking deceit – 1 Peter 3:10; Psalm 34:12-13
My lips will pour forth praise, for you teach me your statutes. My tongue will sing of your word, for all your commandments are right. – Psalm 119:171-172
Set a guard,O Lord, over my mouth; keep watch over the door of my lips! – Psalm 141:3
There are six things that the Lord hates, seven that are an abomination to him: haughty eyes, a lying tongue, and hands that shed innocent blood, a heart that devises wicked plans, feet that make haste to run to evil, false witness who breathes out lies, and one who sows discord among brothers. - Proverbs 6:16-19
v. 6 Blessings are on the head of the righteous,
but the mouth of the wicked conceals violence.
v. 8 The wise of heart will receive commandments,
but a babbling fool will come to ruin.
v. 10 Whoever winks the eye causes trouble,
and a babbling fool will come to ruin.
v. 14 The wise lay up knowledge,
but the mouth of a fool brings ruin near.
v. 19 When words are many, transgression is not lacking,
but whoever restrains his lips is prudent.
v. 20 The tongue of the righteous is choice silver;
the heart of the wicked is of little worth.
v. 21 The lips of the righteous feed many,
but fools die for lack of sense.
v. 31 The mouth of the righteous brings forth wisdom,
but the perverse tongue will be cut off.
v. 32 The lips of the righteous know what is acceptable,
but the mouth of the wicked, what is perverse.
There is one whose rash words are like sword thrusts, but the tongue of the wise brings healing. – Proverbs 12:18
A soft answer turns away wrath, but a harsh word stirs up anger. The tongue of the wise commends knowledge, but the mouths of fools pour out folly. The eyes of the Lord are in every place, keeping watch on the evil and the good. A gentle tongue is a tree of life, but perverseness in it breaks the spirit. – Proverbs 15:1-4
From the fruit of a man’s mouth his stomach is satisfied; he is satisfied by the yield of his lips. Death and life are in the power of the tongue, and those who love it will eat its fruits. – Proverbs 18:20-21
Whoever keeps his mouth and his tongue keeps himself out of trouble. – Proverbs 21:23
For lack of wood the fire goes out, and where there is no whisperer, quarreling ceases. As charcoal to hot embers and wood to fire, so is a quarrelsome man for kindling strife. The words of a gossip are like delicious morsels; they go down into the inner parts of the body. Like the glaze covering an earthen vessel are fervent lips with an evil heart. Whoever hates disguises himself with his lips and harbors deceit in his heart; when he speaks graciously, believe him not. A lying tongue hates its victims, and a flattering mouth works ruin. -Proverbs 26:20-25a; 28
Let no corrupting talk come out of your mouths, but only such as is good for building up, as fits the occasion, that it may give grace to those who hear. - Ephesians 4:29
Let there be no filthiness nor foolish talk nor crude joking, which are out of place, but instead let there be thanksgiving. Ephesians 5:4
Let your speech always be gracious, seasoned with salt, so that you may know how you ought to answer each person. – Colossians 4:6
Remind them to be submissive to rulers and authorities, to be obedient, to be ready for every good work, to speak evil of no one, to avoid quarreling, to be gentle, and to show perfect courtesy toward all people. – Titus 3:1-2