Sayyiduna Abu Hurairah (may Allah be pleased with him) narrated from the Messenger of Allah (peace and blessings be upon him), he said: "Allah made Friday obligatory upon those before us, Allah guided us to it and they differed regarding it, so the people are behind us in this: the Jews (Saturday) and the Christians (Sunday)."
Hadith Referenceمسند اسحاق بن راهويه / كتاب الجمعة / 214
Hadith Takhrij«مسلم ، كتاب الجمعة ، باب هداية هذه الامة ليوم الجمعة ، رقم : 856 . سنن نسائي ، رقم : 1368 . مسند احمد : 509/2 .»