📖 Usamah ibn Zayd RadhiAllahu 'anhu narrated: I said, “O Messenger of Allah, I do not see you fasting any month as much as you fast during Sha'ban.” The Prophet Muhammad SallAllahu 'alaihi wa sallam said, "It (Sha'baan) is a month which (a lot of) people neglect between the months of Rajab and Ramadan. It is a month in which the deeds are raised to the Rabb (Allah Subhaanahu wa Ta'aala) of the worlds and I like for my deeds to be raised while I am fasting."
Source: Sunan An-Nasā’ī 2357
Grade: Hasan (Fair) according to Al-Albani