Proverbs 26:19 in the World English Bible
is the man who deceives his neighbor and says, “Am I not joking?”
Context
18 As a mad man who casteth firebrands, arrows, and death,
19 So is the man that deceiveth his neighbour, and saith, Am not I in sport?
20 Where no wood is, there the fire goeth out: so where there is no talebearer, the strife ceaseth.