7-101 (The compiler of the book narrated) that his father - may God be pleased with him - narrated that Sa’ed ibn Abdullah quoted Yaqoob ibn Yazid, on the authority of Muhammad ibn Abi Umayr, on the authority of some other people that Aba Abdullah as-Sadiq (MGB) said,

“Saturdays are for us. Sundays are for our followers. Mondays are for our enemies. Tuesdays are for the Umayyads. Wednesdays are the days for taking medicine. Thursdays are for taking care of your needs. Fridays are for leaning up and putting on perfume. Fridays are the holidays for the Muslims. They are even better than the Eid ul-Fitr and Eid ul-Azha. The Day of Eid ul-Qadir is the noblest of the holidays. It is on the eighteenth day of the month of Dhul-Hijja. Our Riser (MGB) - the Riser (MGB) from the Members of the Holy Household - will rise on a Friday. The Resurrection Day will be on a Friday. No deeds are better on Fridays than sending God’s Blessings upon Muhammad (MGB) and his Household.”