She is honest

“I durst, my lord, to wager she is honest, Lay down my soul at stake: if you think other, Remove your thought; it doth abuse your bosom. If any wretch have put this in your head, Let heaven requite it with the serpent's curse! For, if she be not honest, chaste, and true, There's no man happy; the purest of their wives Is foul as slander.”

Emilia to Othello

Act 4 ii. 13-20

Iago, how could thou speak such falseness?

       Iago, how could thou speak such falseness? “You told a lie, an odious, damned lie. Upon my soul, a lie, a wicked lie! She false with Cassio?”Thou used the handkerchief to bring charges to Desdemona and Cassio, thy friend, “and your reports have set the murder on.” Thy reports have killed Desdemona. Thou betrayed Cassio among others for reasons of selfishness. I did play a part in this plan for choas. I cannot forgive myself for giving thou the handkerchief. Othello,“the more angel she, and you the blacker devil!” I can't believe thou killed thy wife. “She was chaste, she loved thee, cruel Moor. So come my soul to bliss, as I speak true.”

Emilia to Iago
Act 5 ii. 179-81
Emilia to Othello
Act 5 ii. 132