[1] The man whom the Prophet (ﷺ) asked seemed to have had the habit of observing Saum (fast) on the last days of every month, but he did not carry on this habit in the month of Sha'bân, for Allah's Messenger (ﷺ) had forbidden the Saum (fasting) of the day preceding Ramaçlân immediately. In this narration the Prophet (ﷺ) orders the man to make up for the days of Sha'bân which he missed by observing $aum (fast) on some days in Shawwâl, and that indicates that one should keep his habits of worshipping, and there is no harm if one observes Saum (fast) on the last days of Sha'bân if it is his habit to observe Saum (fasts) on the last days of every month. (Fati Al-Ban, Vol. 5, Page 134,135).