and since knowing this in detail is difficult for most people—even for many scholars—due to their adherence to a specific school of thought, and it is known to everyone engaged in the service of the purified sunnah through collection and understanding that each school contains sunnahs not found in the others, and within all of them, there are sayings and actions that cannot be accurately attributed to the Prophet (ṣallá Allāhu ʿalayhi wa-sallam). This is mostly found in the books of the later scholars, and we often see them asserting with certainty