Is it permissible to perform the Night Vigil (Salat al-Qiyam) on the 30th night of Sha‘ban, considering it as one of the nights of Ramadan, and what is the evidence for its permissibility?

The permissibility of observing the night of the thirtieth of Sha'ban (Tarawih prayer) varies depending on the ruling regarding fasting its day if the crescent moon is not sighted, which is a matter of scholarly disagreement. Many scholars hold that fasting on the Day of Doubt is not permissible, and thus Tarawih prayer is not recommended on its night, citing the hadith (definition) of Ammar ibn Yasir as evidence. However, the Hanbalis believe that fasting on the Day of Doubt is obligatory if clouds obstruct the sighting of the crescent moon, and consequently, Tarawih prayer is required as a precautionary measure on this night.