Majma al-Zawaid — Hadith 11213

It is reported about Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that he recited Surah al-Nur and kept explaining it until he reached this verse: "Indeed, those who accuse chaste, unaware, believing women are cursed in this world and the Hereafter, and for them will be a great punishment." Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: This is concerning Sayyidah Aishah (may Allah be pleased with her) and the wives of the Prophet (peace and blessings be upon him); whoever does this, his repentance will not be accepted. But whoever accuses a woman from among the believing women other than the wives of the Prophet (peace and blessings be upon him), there is room for repentance for him. Then he recited this verse: "Those who accuse chaste women and then do not bring four witnesses, flog them eighty lashes and never accept their testimony; it is they who are the defiantly disobedient, except for those who repent after that and make amends, for indeed Allah is Forgiving, Merciful." So in this verse Allah Almighty granted the right of repentance to one who accuses a believing woman, but He did not grant repentance to one who accuses any of the wives of the Prophet (peace and blessings be upon him). Then he recited this verse: "They are cursed in this world and in the Hereafter, and for them will be a great punishment." Some of those present were about to get up, go to Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) and kiss his head because of the excellence of his explanation.
Al-Tabarani recorded it with several chains; in one of its chains there is a narrator who is not named. The rest of its narrators are thiqat (trustworthy), and it is the best of them.