It was narrated from 'AbduL-Malik bin Minhal, from his father, that the Messenger of Allah P.B.U.H used to enjoin fasting the bnght days -the thirteen th, fourteenth and fifteenth (when the moon is full). He said: "It is like fasting for a lifetime." (Da'if) Another chain from ' Abdul-Malik bin Qatadah bin Malhan Al-Qaisi, from his father, from the Prophet P.B.U.H with similar wording. Ibn Majah said: Shu'bah erred (in the name of one of the narrators) and Hammatn was correct.