"Better to say nothing and be thought a fool than to open your mouth and remove all doubt" - Whoever coined it!
Ecclesiastes 7:5 "It is better to hear the rebuke of the wise, than for a man to hear the song of fools."
Ecclesiastes 10:2 "A wise man's heart is at his right hand; but a fool's heart at his left."
Psalms 75:4-5 "I said unto the fools, Deal not foolishly: and to the wicked, Lift not up the horn: 5 Lift not up your horn on high: speak not with a stiff neck."
Proverbs 1:7 “The fear of the LORD is the beginning of knowledge: but fools despise wisdom and instruction.”
Proverbs 10:18 "He that hideth hatred with lying lips, and he that uttereth a slander, is a fool."
Proverbs 14:7 "Go from the presence of a foolish man, when thou perceivest not in him the lips of knowledge."
Proverbs 15:7 "The lips of the wise disperse knowledge: but the heart of the foolish doeth not so."
Proverbs 15:14 "The heart of him that hath understanding seeketh knowledge: but the mouth of fools feedeth on foolishness."
Proverbs 17:7 "Excellent speech becometh not a fool: much less do lying lips a prince."
Proverbs 17:21 "He that begetteth a fool doeth it to his sorrow: and the father of a fool hath no joy."
Proverbs 17:28 "Even a fool, when he holdeth his peace, is counted wise: and he that shutteth his lips is esteemed a man of understanding."
Proverbs 18:6 "A fool's lips enter into contention, and his mouth calleth for strokes."
Proverbs 18:7 "A fool's mouth is his destruction, and his lips are the snare of his soul."
Proverbs 19:1 “Better is the poor that walketh in his integrity, than he that is perverse in his lips, and is a fool.”
Proverbs 23:9 "Speak not in the ears of a fool: for he will despise the wisdom of thy words."
Proverbs 26:1 "As snow in summer, and as rain in harvest, so honour is not seemly for a fool."
Proverbs 26:3 "A whip for the horse, a bridle for the ass, and a rod for the fool's back."
Proverbs 26:4-5 "Answer not a fool according to his folly, lest thou also be like unto him. 5 Answer a fool according to his folly, lest he be wise in his own conceit."
Proverbs 26:6 "He that sendeth a message by the hand of a fool cutteth off the feet, and drinketh damage."
Proverbs 26:7 "The legs of the lame are not equal: so is a parable in the mouth of fools."
Proverbs 26:8 "As he that bindeth a stone in a sling, so is he that giveth honour to a fool."
Proverbs 23:9 "As a thorn goeth up into the hand of a drunkard, so is a parable in the mouth of fools."
Proverbs 26:10 "The great God that formed all things both rewardeth the fool, and rewardeth transgressors."
Proverbs 26:11 "As a dog returneth to his vomit, so a fool returneth to his folly."
Proverbs 26:12 "Seest thou a man wise in his own conceit? there is more hope of a fool than of him."
Proverbs 27:22 "Though thou shouldest bray a fool in a mortar among wheat with a pestle, yet will not his foolishness depart from him."