Complete conventional hierarchy of authentic reports:
1. Recorded in both Sahih collections — muttafaq ʿalayh.
2. Recorded in Bukhari alone.
3. Recorded in Muslim alone.
4. Outside both, but meeting both compilers’ conditions.
5. Matching Bukhari’s condition alone.
6. Matching Muslim’s condition alone.
7. Authenticated independently without meeting either special condition.
How the ranking works: These are broad presumptive priorities based on source and conditions. Individual reports within the same rank may differ in strength. Verified corroboration, special narrator precision, or indications yielding knowledge can legitimately alter priority in a particular case.