Al-Albaani and His Access to Books in the Al-Dhaahiriyyah Library Which Many Other Shaikhs Never Had the Chance to See
The Imaam said, “I found the hadith with an authentic chain of narration in, ‘Masaa‘il al-Marwazi,’ from Imaam Ahmad and Ishaaq ibn Raahooyah—a very old manuscript which maybe dates back to the third century, a manuscript in the Al-Dhaahiriyyah Library …”
Al-Hudaa wan-Noor, 90.