1 Samuel 21:14

Then said Achish to his servants, Lo, ye see the man is mad: why then have ye brought him to me?

Ecclesiastes 7:7

Surely oppression maketh a wise man mad; and a gift destroyeth the heart.

Treasury of Scripture Knowledge

Summary

Then said Achish unto his servants, Lo, ye see the man is mad: wherefore then have ye brought him to me?

Bible References

Is mad

Ecclesiastes 7:7
Surely oppression maketh a wise man mad; and a gift destroyeth the heart.