Dom Casmurro
Machado de Assis
the first jealousy, sparked by a remark from José Dias (chapter LXII), the horseman under Capitu's window (chapter LXXIII), Sancha's hand (chapter CXVIII), the night of Othello (chapter CXXXV).
Othello
William Shakespeare
Iago's plan in scene 1 of Act II, the green-eyed monster in scene 3 of Act III, and the jealousy that already interprets on its own in scene 1 of Act IV.