The Sabbath in the Qur’an
In the Arabic language, as in the Hebrew language the "first day" of the week corresponds with Sunday of the planetary week. The Islamic and Jewish weekdays begin at sunset. In Arabic, days of the week is numbered except for Friday and Saturday.
Sunday يوم الأحد
الأحد pronounce as AL- AHAD means Day One from the Arabic 'one'-wahid.
Monday يوم الإثنين
الإثنين pronounce as AL-ITHNAYN means Day Two from the Arabic 'two'-ithnayn.
Tuesday يوم الثُّلَاثاء