Act 3 Scene 3
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1) Iago begins by sparking Othello's jealousy in noting how quickly Cassio goes away, "like a thief in the night."
2) Iago questions Othello about his relationship with Cassio, and alludes to his "assistance" with Desdemona and the possibility of inappropriate behave. He doesn't come right out and say anything direct, he just stirs the pot.
3) Iago casts doubt on Cassio's honesty, suggested he is disloyal, and hinted that Desdemona is unfaithful, Iago tells Othello, "O beware, my lord, of jealousy; It is the green-eyed monster which doth mock / the meet it feeds on" (3.3.166-168). That's great, except that by "beware" he really means "I hope you become jealous and kill your wife, because that would be ironic."
4) Othello responds that he has no reason to doubt Desdemona or feel jealousy, Iago then says that if he promises not to be jealous, he should watch Desdemona with Cassio, but objectively, and not out of jealousy."
5) Iago point out Desdemona's lies to her father, insinuating she's deceitful.