Proverbs 25:20 in the World English Bible
As one who takes away a garment in cold weather, or vinegar on soda, so is one who sings songs to a heavy heart.
Context
19 Confidence in an unfaithful man in time of trouble is like a broken tooth, and a foot out of joint.
20 As he that taketh away a garment in cold weather, and as vinegar upon nitre, so is he that singeth songs to an heavy heart.
21 If thine enemy be hungry, give him bread to eat; and if he be thirsty, give him water to drink: