Mufti Taqi Usmani wrote:
On the day immediately following the Night of Bara'ah, i.e. the 15th of Sha'ban, it is mustahabb (advisable) to keep fast. Prophet Muhammad, Sall-Allahu alayhi wa sallam, is reported to have recommended this fast emphatically. Although the scholars of hadith have some doubts in the authenticity of this report, yet it is mentioned earlier that the fasts of the first half of Sha'ban have special merits and Prophet Muhammad, Sall-Allahu alayhi wa sallam, used to fast most of the days in Sha'ban. Moreover, a large number of the elders (salaf) of the Ummah have been observing the fast of the 15th of Sha'ban. This constant practice indicates that they have accepted the relevant hadith as authentic.
Therefore, it is advisable to fast the 15th of Sha'ban as an optional (nafl) fast. One can also keep a fast of qada on this day and it is hoped that he can also benefit from the merits of this fast.
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i also found this in this on al inaam
[quote]Nevertheless, it would be moesta-hub to fast on the fifteenth of Sha-baan for several reasons:
Firstly, it is fully established through a large number of ahaadieth that the Holy Prophet has emphasized the merits of fasting in Sha-baan, and particularly in the first half of the month. The fifteenth day of Sha-baan being the last day of the first half, is included in the preferable days for fasting.
Secondly, the merits of the fifteenth night of Sha-baan is established by more than a dozen ahaadieth. It means that this night should be spent in Iebaadah and other forms of worship. On the other hand, all the blessed nights which the Moesliems are advised to spend in worship are generally followed by fasting on the coming day *(i.e. the nights of two Ieds are an exception, because those days which follow, are the ones in which fasting is totally prohibited. Otherwise such blessed nights are followed by a number of fasts, either obligatory, like in Ramadhaan, or optional like in Zul Hijjah). This is also as in the case of in the Laylatoel Qadr, where fasting on the following day is obligatory, or like the first night (or the ninth night) of Zul Hijjah where fasting on the following days is moesta-hub, hence optional, and also rather advisable. On this analogy, too, the fifteenth night of Sha-baan may be followed by an optional fast, hence, a moesta-hub fasting on the following day.
Therefore, it is advisable to fast the 15th of Sha'ban as an optional (nafl) fast. One can also keep a fast of qada on this day and it is hoped that he can also benefit from the merits of this fast.
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i also found this in this on al inaam
[quote]Nevertheless, it would be moesta-hub to fast on the fifteenth of Sha-baan for several reasons:
Firstly, it is fully established through a large number of ahaadieth that the Holy Prophet has emphasized the merits of fasting in Sha-baan, and particularly in the first half of the month. The fifteenth day of Sha-baan being the last day of the first half, is included in the preferable days for fasting.
Secondly, the merits of the fifteenth night of Sha-baan is established by more than a dozen ahaadieth. It means that this night should be spent in Iebaadah and other forms of worship. On the other hand, all the blessed nights which the Moesliems are advised to spend in worship are generally followed by fasting on the coming day *(i.e. the nights of two Ieds are an exception, because those days which follow, are the ones in which fasting is totally prohibited. Otherwise such blessed nights are followed by a number of fasts, either obligatory, like in Ramadhaan, or optional like in Zul Hijjah). This is also as in the case of in the Laylatoel Qadr, where fasting on the following day is obligatory, or like the first night (or the ninth night) of Zul Hijjah where fasting on the following days is moesta-hub, hence optional, and also rather advisable. On this analogy, too, the fifteenth night of Sha-baan may be followed by an optional fast, hence, a moesta-hub fasting on the following day.
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