What is the ruling on betting, fulfilling a vow by oath on Eid day, and performing supererogatory prayers while holding the Mus'haf?

Betting: 1. Gambling: Unanimously prohibited, as it is a form of qimar (gambling). 2. Competitions: - Without a prize: The general ruling is that it is permissible according to the majority of scholars in anything lawful. The Hanafis permit it specifically for horses, camels, archery, and foot races. - With a prize: It is not permissible except for archery, horses, and camels. The Shafi'is include modern war instruments with these, for the purpose of developing strength and readiness to fight enemies. It is not permissible for anything that has no benefit.

Voluntary prayers from the Mus'haf: The majority of jurists, the Shafi'is and Hanbalis, permit reading from the Mus'haf (Qur'an) during prayer. They based their view on the fact that the Salaf (early Muslims) used to read from Mus'hafs. The Malikis disliked reading from the Mus'haf in obligatory prayers absolutely, but permitted it in voluntary prayers without dislike at the beginning, and disliked it if started during the prayer. Abu Hanifa held that the prayer of one who reads from the Mus'haf is invalid absolutely, but his two companions disagreed with him. Therefore, the conclusion is that reading from the Mus'haf is permissible in both obligatory and voluntary prayers for those who have memorized it and those who have not. The view of disliking it in obligatory prayers is sound, as it goes against the guidance of the Prophet (peace be upon him) and his companions.