Ecclesiastes 10:3

And also as the foolish one went in the way, his heart was wanting, and he said to all, It is folly.

Proverbs 13:16

Every prudent one will do in knowledge: and the foolish one will spread folly.

Proverbs 18:2

The foolish one will not delight in understanding, but in, the disclosings of his heart

Proverbs 18:6

The lips of the foolish one will come into contention, and his mouth will call for blows.

Ecclesiastes 5:3

For the dream came in the multitude of labor; and the voice of the foolish one in the multitude of words.

1 Peter 4:4

In which they are astonished, you not running together in the same pouring out of lavish expense, blaspheming:

Treasury of Scripture Knowledge

Summary

Yea also, when he that is a fool walketh by the way, his wisdom faileth him, and he saith to every one that he is a fool.

Bible References

And he

Ecclesiastes 5:3
For the dream came in the multitude of labor; and the voice of the foolish one in the multitude of words.
Proverbs 13:16
Every prudent one will do in knowledge: and the foolish one will spread folly.
Proverbs 18:2
The foolish one will not delight in understanding, but in, the disclosings of his heart
1 Peter 4:4
In which they are astonished, you not running together in the same pouring out of lavish expense, blaspheming:

General references

1 Kings 12:8
And he will forsake the counsel of the old men which they counseled him, and he will consult with the children which grew up with him which were standing before him.
Proverbs 14:33
In the heart of him understanding, wisdom shall rest: and in the midst of fools it shall be made known.
Proverbs 17:28
Also the foolish one being silent shall be thought wise: and he shutting his lips, understanding.