Sahih Muslim 855
Sahih Muslim · Book 7: The Book of Prayer - Friday · This Ummah has been guided to Friday
Abu Huraira reported Muhammad, the Messenger of Allah (ﷺ), as saying:
وَحَدَّثَنَا مُحَمَّدُ بْنُ رَافِعٍ ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ ، أَخْبَرَنَا مَعْمَرٌ ، عَنْ هَمَّامِ بْنِ مُنَبِّهٍ، أَخِي وَهْبِ بْنِ مُنَبِّهٍ قَالَ هَذَا مَا حَدَّثَنَا أَبُو هُرَيْرَةَ ، عَنْ مُحَمَّدٍ، رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " نَحْنُ الآخِرُونَ السَّابِقُونَ يَوْمَ الْقِيَامَةِ بَيْدَ أَنَّهُمْ أُوتُوا الْكِتَابَ مِنْ قَبْلِنَا وَأُوتِينَاهُ مِنْ بَعْدِهِمْ وَهَذَا يَوْمُهُمُ الَّذِي فُرِضَ عَلَيْهِمْ فَاخْتَلَفُوا فِيهِ فَهَدَانَا اللَّهُ لَهُ فَهُمْ لَنَا فِيهِ تَبَعٌ فَالْيَهُودُ غَدًا وَالنَّصَارَى بَعْدَ غَدٍ " .
We who are the last would be the first on the Day of Resurrection but they (other Ummahs) were given the Book before us and we were given after them, and this was the day that was prescribed for them but they disagreed on it. And Allah guided us to it. and they came after us with regard to it, the Jews observing the next day and the Christians the day following that.