ما هي الأعمال الصالحة التي يمكن إهداؤها للمتوفاة، وهل توجد صيغة دعاء معينة قبل أو بعد إهداء الثواب؟

Scholars have agreed that the deceased benefits from supplication (du'a) and charity given on their behalf. The preponderant view, in our opinion, is that every good deed, such as prayer (salat), fasting (siyam), pilgrimage (hajj), recitation of the Quran, and the like, benefits the deceased, by the permission of Allah. There is no specific supplication in the Sunnah to be recited before or after dedicating the reward to the deceased. The intention of dedication and general supplication suffice. Some scholars have mentioned supplications to be recited when dedicating deeds, among them: "O Allah, make the reward of such-and-such for so-and-so," or "O Allah, if You have rewarded me for this, then make it, or whatever You wish of it, for so-and-so," or "O Allah, reward me for this by Your mercy and make its reward for so-and-so."