Ibn Uthaymeen and Ibn Taymiyah (Rahimahullah) opened that the Hadith regarding Tasbeeh prayer is weak and fabricated. Ibn Hajar and al-lbani graded the Hadith as sound. I want to know on what grounds (grounds like chain of transmission, other similar reports from other Sahaba [R.A]) Ibn Hajar and al-Albani graded the Hadith as sound?

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.

First of all, it should be noted, dear brother, that the Hadeeth about the Tasabeeh prayer was ruled as Saheeh (authentic) not only by Shaykh Al-Albani, but also by other scholars such as ad-Daraqutni, al-Khateeb al-Baghdaadi, and as-Suyooti. As for Ibn Hajar, he classified this Hadeeth as Hasan (acceptable). His classification of this Hadeeth as Hasan was built upon the many ways in which it was narrated and which strengthen one another. Imam Ibn Hajar said in an answer to some of the Ahadeeth (plural of Hadeeth) in Mishkaat Al-Masaabeeh: “Actually this Hadeeth is Hasan based on the many ways (routes/sources) of narration which strengthen the first one. Al-Albani, on the other hand, classified this Hadeeth as Saheeh (authentic), taking into consideration its many ways of narration and evidence. Commenting on Mishkat Al-Masabeeh, he said: “This Hadeeth has many ways of narration and evidence which make one decisively say that it must have a solid basis, contrary to the ruling made by others that it is fabricated (or said: baseless).

For more benefit on the ruling of Tasabeeh Prayer, please refer to Fatwa 83877.

Allah knows best.