Salat At-Tasbih
Question :
Is Salat At-Tasbih an established practice of the Prophet or is it an innovation that is prohibited? Are there any Hadiths that have been related regarding this prayer?
Answer:
A description of Salat At-Tasbih has been related in a very weak Hadith; not even one recognized scholar has ruled that it is authentic. The three Imams neither knew nor heard of this prayer, a fact that shows the Hadith to be weak and not suitable for application.
Source:
Ibn Jibreen
Fatawa Islamiyah, Vol. 7 Pages 223-224