Reference: al-Bid’u wal-Muhdathaat wa maa laa Asla lahu – Page 611
Fataawa al-Lajnah ad-Daa.imah lil-Buhooth al-‘Ilmiyyah wal-Iftaa. – Fatwa No.9760
Question: When my father was alive, he entrusted me to give sadaqah (charity) according to my means on the 15th of Sha’baan every year, and likewise I have been doing this ever since. However, some people have admonished me for doing so saying it is not permissible. So is giving sadaqah on the night of the 15th of Sha’baan permissible according to the willment of my father or not? Kindly advise us and may Allaah reward you with good.
Response: To specify the giving of sadaqah on the night of the 15th of Sha’baan every year is an innovation, and despite your father having entrusted you with that, it is not permissible. It is befitting you give this sadaqah without specifying the night of the 15th of Sha’baan, rather do so every year and in whichever month, but without particularising any one month [on a consistent basis]. However, it is permissible to do so in the month of Ramadhaan [for the evidence which indicates so].
And with Allaah lies all success and may Allaah send prayers and salutations upon our Prophet ﷺ and his family and his companions.