The Book of Characteristics · Hadith 1096 (#Ḥadīth #1)

12-63 حدثنا أبي رضي الله عنه قال: حدثنا سعد بن عبد الله، عن أحمد بن أبي عبد الله البرقي، عن أبيه، عن حماد بن عيسى، عن الصباح بن سيابة، عن أبي جعفر عليه السلام قال: إن الله عز وجل خلق الشهور اثني عشر شهرا وهي ثلاثمائة وستون يوما، فحجر منها ستة أيام خلق فيها السماوات والارضين، فمن ثم تقاصرت الشهور

12-63 (The compiler of the book narrated) that his father - may God be pleased with him - narrated that Sa’ed ibn Abdullah quoted Ahmad ibn Aba Abdullah al-Barqy, on the authority of his father, on the authority of Hammad ibn Isa, on the authority of Al-Sabah ibn Siabat that Abi Ja’far al-Baqir (MGB) said, “The Honorable the Exalted God created the twelve months which are three-hundred and sixty days. However, the six days during which the heavens and the two Earths were created were subtracted. Therefore, some (lunar) months are less than thirty days.”

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