Are there specific supplications to be recited after performing the prayer? Is the congregation's utterance of "We hear and obey, (we seek) Your forgiveness, our Lord, and to You is the return" at the opening takbir permissible or an innovation? How many rak'ahs of supererogatory prayers are there in a day? Did the Prophet not exceed forty rak'ahs in a day and night? Why are some prayers recited audibly and others silently? Should night prayers be recited audibly, and can they be recited silently? Does delaying the 'Isha prayer until after midnight necessitate making it up, or does its time extend until Fajr? Is reciting the Qunut supplication in the last rak'ah of Witr always obligatory?

Abu Dawud mentioned that when Bilal began the Iqama (call to commence prayer) and said, "Qad qamati al-salat" (the prayer has commenced), the Prophet, peace and blessings be upon him, said, "May Allah establish it and perpetuate it." However, Al-Albani and Abd al-Qadir al-Arna'ut deemed this narration weak. As for saying "Sami'na wa ata'na" (We hear and we obey) before or after the ihram (sacred state for prayer), this is an innovation for which nothing has been authentically established. It is authentically narrated in Sahih Muslim that the Prophet, peace and blessings be upon him, said, "There is no servant who prays twelve voluntary rak'at (units of prayer) for Allah every day, other than the obligatory prayers, except that Allah will build for him a house in Paradise." Their details are found in the hadith of Umm Habiba: "Four rak'at before Dhuhr, two after it, two after Maghrib, two after Isha, and two before Fajr." Ibn al-Qayyim mentioned that the Prophet, peace and blessings be upon him, used to regularly perform forty rak'at daily and nightly (17 obligatory, 12 regular Sunnah, 11 night prayers). However, increasing upon these occasionally is not prohibited, as it is authentically reported that he prayed four rak'at of Duha and more, and he prayed eight rak'at of Subhat al-Duha (another form of Duha prayer). It is authentically reported from his sayings, peace and blessings be upon him, the encouragement for two rak'at before Maghrib and four rak'at after Dhuhr. As for the ruling on audible and silent recitation in prayer, it is a confirmed Sunnah in their respective places for the Imam and the individual praying alone. The evidence for this is the action of the Prophet, peace and blessings be upon him, and the majority of scholars agreed with this. As for delaying the Isha prayer until after midnight, this does not make it a qada' (missed prayer) but rather an ada' (on-time performance), due to the saying of the Prophet, peace and blessings be upon him, "Whoever catches one rak'ah of the prayer has caught the prayer." And Qunut (supplication) in Witr prayer is not obligatory.