Muhammad b. Ibrahim b. Ishaq narrated to us. He said: Ahmad b. Muhammad al-Kufi narrated to us from `Ali b. al-Husayn b. `Ali b. Faddal from his father from Abu’l Hasan `Ali b. Musa al-Rida . He said:

Whoever fasts the first day of Rajab in hope for Allah’s reward, Paradise will be made mandatory for him. Whoever fasts a day in the middle [of Rajab] will be able to intercede for the like of Rabi` and Mudar. Whoever fasts a day at the end [of Rajab], Allah will make him from the kings of Paradise; and he will intercede for his father, his mother, his son, his daughter, his brother, his sister, his paternal uncle, his paternal aunt, his maternal uncle, his maternal aunt, his acquaintances, and his neighbours, even if Hell was made mandatory for some of them.