How authentic is the Hadith: "Whoever attends a gathering of knowledge until it concludes, the reward of a Hajj will be written for him"? What is the ruling on disseminating a video clip that contains this Hadith, for which there is no verifiable chain of narration? And how can the dissemination of this clip be rectified?

The gist of the answer: The Hadith: «He who goes to the mosque intending only to learn or teach good, will have the reward like that of a pilgrim whose Hajj is complete» was reported by Al-Tabarani and Al-Hakim. A group of scholars have strengthened and authenticated it. As for the wording: «He who attends a gathering of knowledge until it concludes, will have the reward of a Hajj written for him» – this was not reported and is likely a misconception. Whoever published the clip containing the incorrect wording should delete it or add a comment clarifying the correct wording.