The holy Quran is the holy book of Islam ,
comparable to the Bible in Christianity . Prayer is mandatory (R .
Ahmadian , personal communication , May 4 , 2009 )
Important holidays , according to S . Shoukat (personal communication ,
May 4 , 2009 , include Eid ul-Fitr , also known as the Celebration of the
Feast , Eid el-Adha , also known as the Festival of Sacrifice , Jumu 'ah , or