2 Samuel 15:31 And one told David, saying, Ahithophel is among the conspirators with Absalom. And David said, O LORD, I pray thee, turn the counsel of Ahithophel into foolishness.

Psalms 38:5 My wounds stink and are corrupt because of my foolishness.
69:5 O God, thou knowest my foolishness; and my sins are not hid from thee.

Proverbs 12:23 A prudent man concealeth knowledge: but the heart of fools proclaimeth foolishness.
14:24 The crown of the wise is their riches: but the foolishness of fools is folly.
15:2 The tongue of the wise useth knowledge aright: but the mouth of fools poureth out foolishness.
  14 The heart of him that hath understanding seeketh knowledge: but the mouth of fools feedeth on foolishness.
19:3 The foolishness of man perverteth his way: and his heart fretteth against the LORD.
22:15 Foolishness is bound in the heart of a child; but the rod of correction shall drive it far from him.
24:9 The thought of foolishness is sin: and the scorner is an abomination to men.
27:22 Though thou shouldest bray a fool in a mortar among wheat with a pestle, yet will not his foolishness depart from him.

Ecclesiastes 7:25 I applied mine heart to know, and to search, and to seek out wisdom, and the reason of things, and to know the wickedness of folly, even of foolishness and madness:
10:13 The beginning of the words of his mouth is foolishness: and the end of his talk is mischievous madness.

Mark 7:22 Thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness:

1 Corinthians 1:18 For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God.
  21 For after that in the wisdom of God the world by wisdom knew not God, it pleased God by the foolishness of preaching to save them that believe.
  23 But we preach Christ crucified, unto the Jews a stumblingblock, and unto the Greeks foolishness;
  25 Because the foolishness of God is wiser than men; and the weakness of God is stronger than men.
2:14 But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.
3:19 For the wisdom of this world is foolishness with God. For it is written, He taketh the wise in their own craftiness.