Verses with the word foolishness in the New Testament (7 verses):

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.

1 Corinthians 1:21
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.

1 Corinthians 1:23
But we preach Christ crucified, unto the Jews a stumblingblock, and unto the Greeks foolishness;

1 Corinthians 1:25
Because the foolishness of God is wiser than men; and the weakness of God is stronger than men.

1 Corinthians 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.

1 Corinthians 3:19
For the wisdom of this world is foolishness with God. For it is written, He taketh the wise in their own craftiness.