The Albaani Site

See here for part two.

Questioner: Is the Ṣalātut-Tasbīḥ a mustaḥab prayer? And is it established that the Prophet ﷺ used to pray it all the time? Ibn al-Mubārak said it is encouraged to pray it and that a person should become used to praying it all the time and not neglect it, if that is the case then what is the proof for it?

Al-Albaani: It has not been reported that the Prophet ﷺ prayed it himself but many ḥadīths have been reported from him ﷺ encouraging one to do so, like the ḥadīth of Ibn ʿAbbās that the Prophet ﷺ said to his uncle ʿAbbās, “O ʿAbbās! Shall I not give you a gift? Shall I not give you something? Pray four rakʿahs …” then he ﷺ mentioned this well-known prayer, in every rakʿah there being seventy-five tasbīhs, saying, “If you can observe it once daily, do so; if not, then once weekly; if not, then once a month; if not, then once a year; if not, then once in your lifetime,” then he ﷺ mentioned something else which I don’t recall right now.

There is a long, ongoing dispute about this ḥadīth among the scholars of ḥadīth and what I hold to be the stronger opinion is that the ḥadīth is established through all of its paths of narration, and it is reported in Mishkāh al-Maṣābīh and I have checked it there and also in my book, ‘Ṣaḥīḥ al-Kalimaṭ-Ṭayyib,’ sorry I meant, ‘Ṣaḥīḥ at-Targhīb wat-Tarhīb.’

So in summary the ḥadīth is established based upon all of its paths of narration.

Al-Hudā wan-Nūr, 97.

See here for part four.