Does the account of Bisr ibn Sa’eed suggest the possibility of narrations erroneously attributed to Abu Hurairah and the Prophet, peace and blessings be upon him, which are in fact from Ka’b al-Ahbar? And could this include Sahih al-Bukhari and Sahih Muslim? And what is meant by the last sentence about Abdullah ibn Salam and Ka’b al-Ahbar?

The text of the Hadith narrated by Muslim from Bukair ibn Al-Ashajj from Busr ibn Sa'id indicates that the people of Hadith (muhaddithun) were early to notice the errors and delusions of narrators. Therefore, they stipulated that for a Hadith to be accepted, its narrator must be known for precision (dabt) and memorization (hifz), based on the opinion of Ibn Sirin and others, and that its chain of narrators (rijal) must be examined. Hadith scholars rely on the judgment of contemporary Hadith imams and on comparing a narrator's Hadith with others to distinguish the precise narrator from the imprecise one. Al-Bukhari and Muslim applied this methodology in their Sahih collections, which led the Ummah to agree upon the authenticity of their Hadiths. The phrase "elevated (marfu') Hadiths that were declared defective (illat) as being stopped (mawquf)" means that some narrators might mistakenly elevate the sayings of the Companions or the Tabi'un to the Prophet, peace and blessings be upon him, but Hadith scholars distinguish this by collecting the different chains of transmission (turuq) of the Hadith and comparing them.