Psalms 74:18

74:18 Remember this, [that] the enemy hath reproached, O LORD, and [that] the foolish people have blasphemed thy name.

Jeremiah 4:22

4:22 For my people [is] foolish, they have not known me; they [are] sottish children, and they have none understanding: they [are] wise to do evil, but to do good they have no knowledge.

Jeremiah 5:21

5:21 Hear now this, O foolish people, and without understanding; which have eyes, and see not; which have ears, and hear not:

Galatians 3:1-3

3:1 O foolish Galatians, who hath bewitched you, that ye should not obey the truth, before whose eyes Jesus Christ hath been evidently set forth, crucified among you? 3:2 This only would I learn of you, Received ye the Spirit by the works of the law, or by the hearing of faith? 3:3 Are ye so foolish? having begun in the Spirit, are ye now made perfect by the flesh?