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 (Saturday, the prohibition of fishing) was ordained only for those who differed about it. And most surely your Lord will judge between them on the Day of Resurrection concerning that about which they differed.
Surah An-Nahl