Quran 16:124 from Surah An-Nahl on Divine Marvels.
إِنَّمَا جُعِلَ ٱلسَّبۡتُ عَلَى ٱلَّذِينَ ٱخۡتَلَفُواْ فِيهِۚ وَإِنَّ رَبَّكَ لَيَحۡكُمُ بَيۡنَهُمۡ يَوۡمَ ٱلۡقِيَٰمَةِ فِيمَا كَانُواْ فِيهِ يَخۡتَلِفُونَ
English translation: Only was appointed the Sabbath for those who differed in it And indeed your Lord will surely judge between them (on) the Day (of) the Resurrection in what they used (to) [in it] differ
Transliteration: innama ju'ila al-sabtu ala alladhina ikh'talafu fihi wa-inna rabbaka layahkumu baynahum yawma al-qiyamati fima kanu fihi yakhtalifuna