"O you who believe (Muslims)! When the call is
proclaimed for the Salat (prayer) on the day of
Friday (Jumu'ah prayer), come to the
remembrance of ALLAH (Jumu'ah religious
talk (Khutbah) and Salat (prayer)) and leave off
business (and every other thing), that is
better for you if you did but know. Then
when the (Jumu'ah) Salat (prayer) is finished,
you may disperse through the land, and seek
the Bounty of ALLAH (by working, etc.), and
remember ALLAH much, that you may be
successful."
(Quran, Chapter 62, Verses #9 & 10)