1 Samuel 21:14

Then Achish said to his servants, "Look, you see a madman! Why did you bring him to me?

Ecclesiastes 7:7

Surely oppression makes a fool of the wise, and a bribe corrupts 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 makes a fool of the wise, and a bribe corrupts the heart.