Ecclesiastes 10:3

When he who is a fool walks along the path, his wisdom fails him, and he says to every one that he is a fool.

Proverbs 13:16

Every prudent man acts with knowledge. A fool displays his folly.

Proverbs 18:2

A fool (stupid person) does not like understanding when revealing his thoughts.

Proverbs 18:6

A fool's lips want to argue. His mouth calls for blows.

Ecclesiastes 5:3

Dreams come with many efforts, trials and concerns. Fools speak with too many words.

1 Peter 4:4

They think it strange that you do not run with them in wild and reckless living and they speak evil about you.

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
Dreams come with many efforts, trials and concerns. Fools speak with too many words.
Proverbs 13:16
Every prudent man acts with knowledge. A fool displays his folly.
Proverbs 18:2
A fool (stupid person) does not like understanding when revealing his thoughts.
1 Peter 4:4
They think it strange that you do not run with them in wild and reckless living and they speak evil about you.

General references

1 Kings 12:8
But he paid no attention to the opinion of the elders. He went to the young men who were his advisors:
Proverbs 14:33
Wisdom rests in the heart of the man with understanding. That in the heart of fools is made known.
Proverbs 17:28
Even a fool, when he holds his peace, is counted wise! He who shuts his mouth is esteemed a man of understanding.