Assalam O Alaikum.
I saw an interview of Mufti Rafi Usmani sb on
www.azaantv.tv regarding 'Ideology of Pakistan'. In that he mentioned when there was a demand of implementation of shariat after formation of Pakistan, people asked this same question. So, all the great scholars of their respective communities who are considered Imams by their community got together, and after 3 days of discussions, presented a full walkthrough as to how to implement sharia, with all the respective communities agreed.
Ma3assalama.
Bookmarks