Muhammad ibn Yaqub, from a number of our companions, from Sahl ibn Ziyad, from Mansur ibn al-Abbas, from Muhammad ibn Abdullah ibn Rafi, from Ismail ibn Sahl, from a man, from Abu Abdillah عليه السلام: Abu Abdillah عليه السلام left Madinah during days remaining from Shaban, and he was fasting. Then the month of Ramadan entered upon the Imam عليه السلام while he was travelling, so the Imam عليه السلام broke the fast. It was said to Imam عليه السلام: “Do you fast Shaban and break the fast in the month of Ramadan?” Imam عليه السلام said: “Yes. Shaban is up to me; if I wish, I fast it, and if I wish, I do not. But the month of Ramadan is a firm obligation from Allah سبحانه وتعالى, Mighty and Majestic, to break the fast.”