Psalm 109:18-19. World English Bible with "bowels" (KJV) replacing "inward parts". I sung "garment" for "clothing" in v19 by accident. I know enough about bitterness to know that if you entertain it and give it room, it soaks into you and it's hard to get the taste out.

Capo 3
Am Dm Em Am
C Dm F C Dm Am Em
C Dm Em Am

18 He clothed himself also with cursing as with his garment.
It came into his inward parts (bowels) like water,
like oil into his bones.
19 Let it be to him as the clothing with which he covers himself,
for the belt that is always around him.