bu Huraira (Radi'Allahu anhu) reported
the Apostle of Allah ((Sall'Allahu alaihi wa sallam) as saying:

The best day on which the sun has risen is
Friday;
on it Adam (Alaihis-Salam) was created.
on it he was made to enter Paradise,
on it he was expelled from it.
And the last hour will take place
on no day other than Friday.

(Sahih Muslim ~ Book #004, Hadith #1857)