Rank 1: a report recorded by both compilers — the shared inclusion of a report in Bukhari and Muslim, along with their overall scholarly reception, normally gives it the highest rank in this source-based hierarchy.
Rank 2: a report recorded by Bukhari alone — present in Bukhari but absent from Muslim. The majority’s general preference for Bukhari places this class ahead of the next.
Rank 3: a report recorded by Muslim alone — found in Muslim but not Bukhari. The category retains the general scholarly standing of the Sahih collections while occupying third place in the conventional hierarchy.
Qualification: These are source-based ranks, not irrevocable rulings about every individual case. Independent routes, superior preservation, and other strong indications can alter a particular comparison.