It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Holy Prophet (peace and blessings be upon him) said: Allah had made Friday obligatory upon the people before us as well, but they differed regarding it, whereas Allah guided us in this matter. Thus, now people follow us concerning this day; the day after (Saturday) is for the Jews and the day after that (Sunday) is for the Christians.