A part of exactly the same sermon in describing his issue prior to allegiance was paid to him (after the death with the Holy Prophet) is obligatory and Some others whose ignorance with the folks is permissible. In addition it includes what appears for being obligatory based on the Book2 https://canvas.instructure.com/eportfolios/949849/Home/Sales_Trap__We_Love_To_Talk_But_Need_To_Pay_Attention