[Psa 37:30 KJV] 30 The mouth of the righteous speaketh wisdom, and his tongue talketh of judgment.

[Psa 39:1 KJV] 1 [[To the chief Musician, [even] to Jeduthun, A Psalm of David.]] I said, I will take heed to my ways, that I sin not with my tongue: I will keep my mouth with a bridle, while the wicked is before me.

[Psa 119:13, 46, 172 KJV] 13 With my lips have I declared all the judgments of thy mouth. ... 46 I will speak of thy testimonies also before kings, and will not be ashamed. ... 172 My tongue shall speak of thy word: for all thy commandments [are] righteousness.

[Psa 141:3 KJV] 3 Set a watch, O LORD, before my mouth; keep the door of my lips.

[Pro 12:18-20 KJV] 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. 20 Deceit [is] in the heart of them that imagine evil: but to the counsellors of peace [is] joy.

[Pro 15:1-2, 4, 7 KJV] 1 A soft answer turneth away wrath: but grievous words stir up anger. 2 The tongue of the wise useth knowledge aright: but the mouth of fools poureth out foolishness. ... 4 A wholesome tongue [is] a tree of life: but perverseness therein [is] a breach in the spirit. ... 7 The lips of the wise disperse knowledge: but the heart of the foolish [doeth] not so.

[Pro 16:21, 23-24 KJV] 21 The wise in heart shall be called prudent: and the sweetness of the lips increaseth learning. ... 23 The heart of the wise teacheth his mouth, and addeth learning to his lips. 24 Pleasant words [are as] an honeycomb, sweet to the soul, and health to the bones.

[Pro 31:26 KJV] 26 She openeth her mouth with wisdom; and in her tongue [is] the law of kindness.

[Ecc 12:9-11 KJV] 9 And moreover, because the preacher was wise, he still taught the people knowledge; yea, he gave good heed, and sought out, [and] set in order many proverbs. 10 The preacher sought to find out acceptable words: and [that which was] written [was] upright, [even] words of truth. 11 The words of the wise [are] as goads, and as nails fastened [by] the masters of assemblies, [which] are given from one shepherd.

[Eph 4:25, 29 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.

[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.

[1Pe 3:15-16 KJV] 15 But sanctify the Lord God in your hearts: and [be] ready always to [give] an answer to every man that asketh you a reason of the hope that is in you with meekness and fear: 16 Having a good conscience; that, whereas they speak evil of you, as of evildoers, they may be ashamed that falsely accuse your good conversation in Christ.

[Rev 14:5 KJV] 5 And in their mouth was found no guile: for they are without fault before the throne of God.