before this joseph brought you clear signs but you continued to be doubtful of that which he brought. when he passed away you said allah will never send another messenger after him. as such allah leads astray the sinner the doubter.
ولقد جاءكم يوسف من قبل بالبينات فما زلتم في شك مما جاءكم به حتى إذا هلك قلتم لن يبعث الله من بعده رسولا كذلك يضل الله من هو مسرف مرتاب