It is narrated from Sayyiduna Abu al-Darda (may Allah be pleased with him) that he said: "Soon there will come people who will recite it with the words 'ghalabatir-Rum' (that is, the Romans have prevailed), whereas it (the correct reading) is 'ghulibatir-Rum' [Surah al-Rum: 2] (that is, the Romans have been defeated)." This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.