[Exo 22:28 KJV] 28 Thou shalt not revile the gods, nor curse the ruler of thy people.
[Psa 10:7-8 KJV] 7 His mouth is full of cursing and deceit and fraud: under his tongue [is] mischief and vanity. 8 He sitteth in the lurking places of the villages: in the secret places doth he murder the innocent: his eyes are privily set against the poor.
[Psa 34:13 KJV] 13 Keep thy tongue from evil, and thy lips from speaking guile.
[Psa 41:5-9 KJV] 5 Mine enemies speak evil of me, When shall he die, and his name perish? 6 And if he come to see [me], he speaketh vanity: his heart gathereth iniquity to itself; [when] he goeth abroad, he telleth [it]. 7 All that hate me whisper together against me: against me do they devise my hurt. 8 An evil disease, [say they], cleaveth fast unto him: and [now] that he lieth he shall rise up no more. 9 Yea, mine own familiar friend, in whom I trusted, which did eat of my bread, hath lifted up [his] heel against me.
[Psa 64:2-5 KJV] 2 Hide me from the secret counsel of the wicked; from the insurrection of the workers of iniquity: 3 Who whet their tongue like a sword, [and] bend [their bows to shoot] their arrows, [even] bitter words: 4 That they may shoot in secret at the perfect: suddenly do they shoot at him, and fear not. 5 They encourage themselves [in] an evil matter: they commune of laying snares privily; they say, Who shall see them?
[Pro 4:24 KJV] 24 Put away from thee a froward mouth, and perverse lips put far from thee.
[Pro 10:11, 19, 31-32 KJV] 11 The mouth of a righteous [man is] a well of life: but violence covereth the mouth of the wicked. ... 19 In the multitude of words there wanteth not sin: but he that refraineth his lips [is] wise. ... 31 The mouth of the just bringeth forth wisdom: but the froward tongue shall be cut out. 32 The lips of the righteous know what is acceptable: but the mouth of the wicked [speaketh] frowardness.
[Pro 12:5-6, 13, 17-19 KJV] 5 The thoughts of the righteous [are] right: [but] the counsels of the wicked [are] deceit. 6 The words of the wicked [are] to lie in wait for blood: but the mouth of the upright shall deliver them. ... 13 The wicked is snared by the transgression of [his] lips: but the just shall come out of trouble. ... 17 [He that] speaketh truth sheweth forth righteousness: but a false witness deceit. 18 There is that speaketh like the piercings of a sword: but the tongue of the wise [is] health. 19 The lip of truth shall be established for ever: but a lying tongue [is] but for a moment.
[Pro 15:1, 4, 28 KJV] 1 A soft answer turneth away wrath: but grievous words stir up anger. ... 4 A wholesome tongue [is] a tree of life: but perverseness therein [is] a breach in the spirit. ... 28 The heart of the righteous studieth to answer: but the mouth of the wicked poureth out evil things.
[Pro 16:27-28 KJV] 27 An ungodly man diggeth up evil: and in his lips [there is] as a burning fire. 28 A froward man soweth strife: and a whisperer separateth chief friends.
[Pro 26:20-23, 28 KJV] 20 Where no wood is, [there] the fire goeth out: so where [there is] no talebearer, the strife ceaseth. 21 [As] coals [are] to burning coals, and wood to fire; so [is] a contentious man to kindle strife. 22 The words of a talebearer [are] as wounds, and they go down into the innermost parts of the belly. 23 Burning lips and a wicked heart [are like] a potsherd covered with silver dross. ... 28 A lying tongue hateth [those that are] afflicted by it; and a flattering mouth worketh ruin.
[Ecc 10:11, 20 KJV] 11 Surely the serpent will bite without enchantment; and a babbler is no better. ... 20 Curse not the king, no not in thy thought; and curse not the rich in thy bedchamber: for a bird of the air shall carry the voice, and that which hath wings shall tell the matter.
[Isa 32:6-7 KJV] 6 For the vile person will speak villany, and his heart will work iniquity, to practise hypocrisy, and to utter error against the LORD, to make empty the soul of the hungry, and he will cause the drink of the thirsty to fail. 7 The instruments also of the churl [are] evil: he deviseth wicked devices to destroy the poor with lying words, even when the needy speaketh right.
[Mat 12:34-37 KJV] 34 O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh. 35 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. 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.
[Eph 4:25, 29, 31 KJV] 25 Wherefore putting away lying, speak every man truth with his neighbour: for we are members one of another. ... 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. ... 31 Let all bitterness, and wrath, and anger, and clamour, and evil speaking, be put away from you, with all malice:
[Jas 3:5-10 KJV] 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.
[Jas 4:11 KJV] 11 Speak not evil one of another, brethren. He that speaketh evil of [his] brother, and judgeth his brother, speaketh evil of the law, and judgeth the law: but if thou judge the law, thou art not a doer of the law, but a judge.