حَدَّثَنَا عَمْرُو بْنُ عُثْمَانَ، حَدَّثَنَا أَبُو الْمُغِيرَةِ، حَدَّثَنِي صَفْوَانُ، عَنْ شُرَيْحِ بْنِ عُبَيْدٍ، عَنْ سَعْدِ بْنِ أَبِي وَقَّاصٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ ‏"‏ إِنِّي لأَرْجُو أَنْ لاَ تُعْجِزَ أُمَّتِي عِنْدَ رَبِّهَا أَنْ يُؤَخِّرَهُمْ نِصْفَ يَوْمٍ ‏"‏ ‏.‏ قِيلَ لِسَعْدٍ وَكَمْ نِصْفُ يَوْمٍ قَالَ خَمْسُمِائَةِ سَنَةٍ ‏.‏

Narrated Sa'd ibn AbuWaqqas: The Prophet (PBUH) said: I hope my community will not fail to maintain their position in the sight of their Lord if He delays them half a day. Sa'd was asked: How long is half a day? He said: It is five hundred years. Translation Not Available

Book Ref: Sunan Abi Dawud Book 39 Hadith 4350
Web Ref:  Sunan Abi Dawud Book 38 Hadith 4336