إِنَّمَا جُعِلَ السَّبْتُ عَلَى الَّذِينَ اخْتَلَفُواْ فِيهِ وَإِنَّ رَبَّكَ لَيَحْكُمُ بَيْنَهُمْ يَوْمَ الْقِيَامَةِ فِيمَا كَانُواْ فِيهِ يَخْتَلِفُونَ
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سورة النحل
(16/124) The sabbath was only appointed for those who differed thereon; and verily thy Lord will judge between them on the Judgment-Day concerning that wherein they have been differing.
Surah An-Nahl