Sahih Muslim Book 9, Hadith Number 3568.

Chapter: Li’an (Invoking curse).

‘Abdullah b Shaddad reported that mention was made about the invokers of curses before Ibn ‘Abbas (Allah be pleased with them). Ibn Shaddad said: Are these the two about whom Allah’s Apostle (clay peace be upon him) said: “If I were to stone one without evidence, I would have definitely stoned her”? Ibn Abbas (Allah be pleased with them) said: She is not this woman; but she is the one who (committed adultery) openly.