Hadith record

2. A number of our people have narrated from Sahl ibn Ziyad Muhammad ibn ‘Isma’il from certain persons of his people who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘Allah, most Blessed, most High, created the world in six days, then He took away this from the days of the year which became three hundred fifty four days. The month of al-Sha‘ban is never complete and the month of Ramadan, by Allah is never less. A duty (obligation) is never left incomplete. Allah, most Majestic, most Glorious, says, “You must complete the term.” (2:181) Shawwal is twenty-nine days, Dhu al-Qa’dah is thirty days because of the words of Allah, most Majestic, most Glorious, “We made an appointment with Musa (Moses) for thirty days and We completed it with ten more days so the appointment with his Lord lasted for forty days.” (7:142) Dhu al-Hajjah has twenty-nine days and Muharram has thirty days, then the other months thereafter, one is complete and the next incomplete.’”

Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.