A great reward is gained from fasting on the first day of Sha’ban. Imam Ja’far al-Sadiq(a.s.) is reported as saying, “Paradise will be incumbently decided for one who observes fasting on the first day of Sha’ban.”
Likewise, Sayyid Ibn Tawus has narrated on the authority of the Holy Prophet (s.a.w.a.) that an abundant reward will be conferred to one who observes fasting on three days in Sha’ban at the nights of which a two unit prayer is offered. In each unit of this prayer, one should recite Surah al-Faatehah once and Surah al-Tawheed eleven times.