Sahih Muslim · Hadith 2756

وحدثنيه إسحاق بن منصور، أخبرنا عبيد الله بن موسى، عن سفيان، بهذا الإسناد وقال صوم شهرين ‏.‏

This hadith has been narrated on the authority of Sufyan with the same chain of transmitters in which it is said: " Fasting of two months."

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).