[Psa 12:3 KJV] 3 The LORD shall cut off all flattering lips, [and] the tongue that speaketh proud things:

[Psa 34:11-13 KJV] 11 Come, ye children, hearken unto me: I will teach you the fear of the LORD. 12 What man [is he that] desireth life, [and] loveth [many] days, that he may see good? 13 Keep thy tongue from evil, and thy lips from speaking guile.

[Psa 140:3 KJV] 3 They have sharpened their tongues like a serpent; adders' poison [is] under their lips. Selah.

[Mat 12:36-37 KJV] 36 But I say unto you, That every idle word that men shall speak, they shall give account thereof in the day of judgment. 37 For by thy words thou shalt be justified, and by thy words thou shalt be condemned.

[Mat 15:18-19 KJV] 18 But those things which proceed out of the mouth come forth from the heart; and they defile the man. 19 For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:

[Jas 3:2-13 KJV] 2 For in many things we offend all. If any man offend not in word, the same [is] a perfect man, [and] able also to bridle the whole body. 3 Behold, we put bits in the horses' mouths, that they may obey us; and we turn about their whole body. 4 Behold also the ships, which though [they be] so great, and [are] driven of fierce winds, yet are they turned about with a very small helm, whithersoever the governor listeth. 5 Even so the tongue is a little member, and boasteth great things. Behold, how great a matter a little fire kindleth! 6 And the tongue [is] a fire, a world of iniquity: so is the tongue among our members, that it defileth the whole body, and setteth on fire the course of nature; and it is set on fire of hell. 7 For every kind of beasts, and of birds, and of serpents, and of things in the sea, is tamed, and hath been tamed of mankind: 8 But the tongue can no man tame; [it is] an unruly evil, full of deadly poison. 9 Therewith bless we God, even the Father; and therewith curse we men, which are made after the similitude of God. 10 Out of the same mouth proceedeth blessing and cursing. My brethren, these things ought not so to be. 11 Doth a fountain send forth at the same place sweet [water] and bitter? 12 Can the fig tree, my brethren, bear olive berries? either a vine, figs? so [can] no fountain both yield salt water and fresh. 13 Who [is] a wise man and endued with knowledge among you? let him shew out of a good conversation his works with meekness of wisdom.

[Jas 1:26 KJV] 26 If any man among you seem to be religious, and bridleth not his tongue, but deceiveth his own heart, this man's religion [is] vain.

[Pro 10:20-21, 31 KJV] 20 The tongue of the just [is as] choice silver: the heart of the wicked [is] little worth. 21 The lips of the righteous feed many: but fools die for want of wisdom. ... 31 The mouth of the just bringeth forth wisdom: but the froward tongue shall be cut out.

[Pro 11:30 KJV] 30 The fruit of the righteous [is] a tree of life; and he that winneth souls [is] wise.

[Pro 16:27 KJV] 27 An ungodly man diggeth up evil: and in his lips [there is] as a burning fire.

[Pro 18:4-8 KJV] 4 The words of a man's mouth [are as] deep waters, [and] the wellspring of wisdom [as] a flowing brook. 5 [It is] not good to accept the person of the wicked, to overthrow the righteous in judgment. 6 A fool's lips enter into contention, and his mouth calleth for strokes. 7 A fool's mouth [is] his destruction, and his lips [are] the snare of his soul. 8 The words of a talebearer [are] as wounds, and they go down into the innermost parts of the belly.

[2Ti 2:23-25 KJV] 23 But foolish and unlearned questions avoid, knowing that they do gender strifes. 24 And the servant of the Lord must not strive; but be gentle unto all [men], apt to teach, patient, 25 In meekness instructing those that oppose themselves; if God peradventure will give them repentance to the acknowledging of the truth;

[Rom 10:14-15 KJV] 14 How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher? 15 And how shall they preach, except they be sent? as it is written, How beautiful are the feet of them that preach the gospel of peace, and bring glad tidings of good things!

[2Co 2:16 KJV] 16 To the one [we are] the savour of death unto death; and to the other the savour of life unto life. And who [is] sufficient for these things?

[Eph 4:29 KJV] 29 Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers.

[Col 4:6 KJV] 6 Let your speech [be] alway with grace, seasoned with salt, that ye may know how ye ought to answer every man.