Muslim

So if the reason, according to those we have described, is his previous statement regarding the invalidity and weakening of the hadith, when it is not known that the narrator has heard anything from the one he narrates from, and the possibility of it being mursal exists, then it is necessary for him to abandon using as proof, in support of his statement, the narration of one who is known to have heard from the one he narrates from, except in the very report in which mention of hearing is found, as we have explained previously, from the imams who transmitted the reports, that at times they would send the hadith as mursal, and would not mention from whom they heard it, and at other times they would be diligent and attribute the report according to how they heard it, informing about descending if they descended, and about ascending if they ascended, as we have explained from them.