Sayyiduna Hudhayfah (may Allah be pleased with him) reports this saying of the Prophet (peace and blessings be upon him): "Falsely accusing a chaste woman of fornication demolishes the deeds of a hundred years."
Al-Tabarani and al-Bazzar recorded it; its chain contains Layth bin Abi Sulaym, who is da'if (weak), though his hadith is sometimes graded hasan (good); the rest of its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الحدود والديات / 10682