He traced it back to the Prophet ﷺ, "Whoever performs the pilgrimage to this House and does not engage in obscene speech or commit any sin returns as on the day his mother bore him."
حدثنا سفيان عن منصور عن أبي حازم
يبلغ به النبي ﷺ من أم هذا البيت فلم يرفث ولم يفسق رجع كيوم ولدته أمه
Its isnad is sahih. Bukhari 17:4 and Muslim 1:382 both narrated it through the route of Sufyan, from Mansur, with this isnad. It has already passed as 7136, through the narration of Sayyar Abu Hakam, from Abu Hazim, with it.