Accordingly, any report to which the verdict “ḥasan ṣaḥīḥ” is attached is lower than one to which only “ṣaḥīḥ” is applied, because a categorical ruling is stronger than a hesitant one, and this holds when the report is transmitted through a single chain (1).
Otherwise (2), that is, if (3) the narration is not unique (4), applying the two descriptions together refers to two separate isnāds—one of them ṣaḥīḥ and the other ḥasan.
On this basis, a report that is called “ḥasan ṣaḥīḥ” is higher (5) than one that is called merely “ṣaḥīḥ,” provided the latter is solitary (6), for a multiplicity of transmission routes lends extra strength (7).
If it is said: “Al-Tirmidhī (8) has explicitly stated that the condition for a ḥasan report is that it be related through more than one route; so how can he say about some narrations, ‘ḥasan gharīb, and we do not know it (9) except through this route’ (10)?!”
[The ḥasan ḥadīth according to al-Tirmidhī]
The answer is that al-Tirmidhī did not define the ḥasan in absolute terms; he defined only a particular type (11) that appears in his compilation, namely the narration about which he says: