Is an unknown narrator, an ambiguous narrator, or a disconnected narration acceptable in corroborating narrations and supporting chains, and does a mursal (report missing the Companion link) support another mursal?

The questioner : We begin with the questions regarding hadith, if Allah wills. The first question is to His EminenceThe Shaykh : He asks: Is an unknown narrator, an ambiguous narrator, or a disconnected narration acceptable in corroborating narrations and supporting chains, and does a mursal (report missing the Companion link) support another mursal?

The Shaykh : As for a mursal (report missing the Companion link) supporting another mursal, that is not permissible.

The questioner : Absolutely?

The Shaykh : Absolutely not, because there is a strong possibility that the intermediary between each of the mursal narrators is the same person. Since this intermediary is unknown, this ignorance is the reason for rejecting the use of the mursal hadith as evidence. If there is one mursal and another mursal, or even multiple mursal narrations, it is highly probable that these mursal narrations trace back to the report of a single unknown person. Therefore, a mursal is not used as evidence by strengthening it with another mursal, except that there is a nuance that must be observed: if each of the mursal narrators is from two different countries, and it is established by the researcher that there is no meeting between them, or that neither traveled to the other's country, and if this negation of meeting or travel is established, then one may be reassured in strengthening a mursal with another mursal under this condition. Because in this case, the possibility that the report of each mursal narrator traces back to a single person is weakened. In reality, this is more theoretical than practical, but if such a theoretical case occurs practically for some researchers, he may strengthen it in that way.