The Book of Characteristics · Hadith 1149 (#Ḥadīth #4)

21-4 حدثنا محمد بن علي ماجيلويه رضي الله عنه قال: حدثنا علي بن إبراهيم ابن هاشم، عن أبيه، عن ياسر الخادم قال: قلت للرضا عليه السلام: هل يكون شهر رمضان تسعة وعشرين يوما؟ فقال: إن شهر رمضان لا ينقص عن ثلاثين يوما

21-4 Muhammad ibn Ali Majiluyih - may God be pleased with him - narrated that Ali ibn Ibrahim ibn Hashim quoted his father, on the authority of Yasir - the servant (of Imam Al-Ridha (MGB)), “I asked Al-Ridha (MGB), ‘Would the month of Ramazan ever be twenty-nine days?’’ The Imam (MGB) replied, ‘No. The month of Ramazan will never be less than thirty days.’”

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