21-10 Ahmad ibn Zyad ibn Ja’far al-Hamedany - may God be pleased with him - narrated that Ali ibn Ibrahim ibn Hashim quoted his father, on the authority of Hammad ibn Isa, on the authority of Hurayz, on the authority of Zurarah that Abi Ja’far al-Baqir (MGB) said,

“God has made it incumbent upon the people to say thirty-five prayers from one Friday to the next. It has been made obligatory for one to attend a congregational prayer, and that is the Friday prayer.”