Specifying the day of the 15th of Sha'baan by fasting or reciting the Qur.aan or performing naafilah prayers
Question: We see some people specifying the 15th of Sha'baan with particular supplications and reciting the Qur.aan and performing naafilah prayers. So what is the correct position concerning this, and may Allaah reward you with good?
Response: That which is correct is that fasting the 15th of Sha'baan or specifying it with reciting (the Qur.aan) or making (particular) supplications has no basis. So the day of the 15th of Sha'baan is like any other 15th day of other months. So from that which is known is that it has been legislated for a person to fast the 13th, 14th and 15th of every month, however, Sha'baan is characterised unlike the other months in that (except for Ramadhaan) the Prophet (sal-Allaahu `alayhe wa sallam) used to fast more in Sha'baan than any other month . So he used to either fast all of Sha'baan or just a little. Therefore, as long as it does not cause difficulty for a person, it is befitting to increase in fasting during Sha'baan in adherence to the example of the Prophet (sal-Allaahu `alayhe wa sallam).
Shaykh Ibn 'Uthaymeen
al-Bid'u wal-Muhdathaat wa maa laa Asla lahu - Page 612
Fataawa Shaykh Muhammad Ibn Saalih al-'Uthaymeen - Volume 1, Page 190
Standing the night of the 15th of Sha'baan in prayer and fasting during it's day
Question: Is standing the night of the 15th of Sha'baan in prayer and fasting during it's day legislated?
Response: Nothing firm and reliable has been established on the authority of the Prophet (sal-Allaahu `alayhe wa sallam) that he stood in prayer in the night and fasted during the day of the 15th of Sha'baan. So the night of the 15th of Sha'baan is like any other night, and if someone is a regular worshipper during other nights, then he may stand the night in prayer on this night without assuming anything special (because of it being the night of the 15th of Sha'baan). This is because specifying a time for any act of worship requires a authentic proof, so if there is no authentic proof then the act is regarded as an innovation and all innovations are misguidance. Likewsie, regarding specifically fasting during the 15th day of Sha'baan, then no (authentic) proof has been established on the authority of the Prophet (sal-Allaahu `alayhe wa sallam) to indicate the legislation of fasting on that particular day.
As for that which is mentioned from the ahaadeeth regarding this subject, then all of it is weak as the people of knowledge have indicated. However, whoever has the habit of fasting the 13th, 14th and 15th (of every month), then he can continue and fast during Sha'baan as he fasts during the other months, without assuming anything special about the 15th of Sha'baan. Also, the Prophet (sal-Allaahu `alayhe wa sallam) used to increase in fasting during this month (Sha'baan), however, he did not particularise the 15th day, rather proceeded as per norm.
Shaykh Ibn Fowzaan
al-Bid'u wal-Muhdathaat wa maa laa asla lahu - Page 614
Noorun alad-Darb Fataawa Shaykh Saalih Ibn Fowzaan - Volume 1, Page 87
Giving sadaqah specifically on the night of 15th of Sha'baan
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 (sal-Allaahu `alayhe wa sallam) and his family and his companions.
The Permanent Committee for Islaamic Research and Fataawa
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