Proverbs 24:9

9 The thought of foolishness is sin: and the scorner is an abomination to men.

Proverbs 24:9 In-Context

7 Wisdom is too high for a fool: he openeth not his mouth in the gate.
8 He that deviseth to do evil shall be called a mischievous person.
9 The thought of foolishness is sin: and the scorner is an abomination to men.
10 If thou faint in the day of adversity, thy strength is small.
11 If thou forbear to deliver them that are drawn unto death, and those that are ready to be slain;
The King James Version is in the public domain.