Hasan (hadith)
Hasan is an Arabic language word. It is used in Hadith evaluation, meaning roughly "good."
The word is used to describe hadith whose authenticity is not as well-established as that of ṣaḥīḥ hadith, but sufficient for use as supporting evidence.
Evaluation
Ibn Hajar defines a hadith that is ḥasan lidhatihi"''ḥasan in and of itself"with the same definition a ṣaḥīḥ hadith except that the competence of one of its narrators is less than complete; while a hadith that is ḥasan lighairihi is determined to be ḥasan due to corroborating factors such as numerous chains of narration. He states that it is then comparable to a ṣaḥīḥ hadith in its religious authority. Hasan hadīth is transmitted through an unbroken chain of narrators all of whom are of sound character but weak memory. A ḥasan hadith may rise to the level of being ṣaḥīḥ if it is supported by numerous isnād ; in this case that hadith would be ḥasan lidhatihi but, once coupled with other supporting chains, becomes ṣaḥīḥ lighairihi''.al-Tirmidhi defined Hasan as a Hadith which does not contain a reporter accused of lying and it is not Shadh and the Hadith has been reported through more than one Sanad.
Khattabi, a commentator on Sunan Abu Dawud, defined Hasan:
Thus, there is a difference in definition between al-Tirmidhi and others. Tirmidhi requires several chains of transmitters, while according to the majority, a tradition with a single chain can also be classified as Hasan.
Mohammad Hashim Kamali says, Hasan hadīth may be elevated to the level of Şahīh if it is endorsed by another hadīth with a stronger isnād.