the Sunan collections concerning Bilāl’s call to prayer (1).
Likewise, the single form of the iqāma is the one established in Bilāl’s call to prayer, while the double form of the iqāma is established in an authentic report concerning Abū Mahdhūra’s call to prayer. Ahmad and other hadith jurists adopted Bilāl’s call to prayer and iqāma; al-Shāfiī adopted Abū Mahdhūra’s call to prayer and Bilāl’s iqāma; and Abū Hanīfa adopted Bilāl’s call to prayer and Abū Mahdhūra’s iqāma (2).
All these practices are permissible by the Sunnah of the Messenger of Allah, peace and blessings be upon him. Although some jurists consider certain practices among them disliked because they believe (3) that it has not been established that such a practice was instituted for the call to prayer, this does not impugn the knowledge of one who knows it to be Sunnah.
The same applies to the various forms of the fear prayer. Multiple forms are authentically established from the Prophet, peace and blessings be upon him, including the prayer at Dhāt al-Riqā, the prayer at Usfān, and the prayer in Najd. At Usfān, he led them as a congregation in a single prayer (4), but arranged them in two rows. One row bowed with him, all together, and the first row prostrated with him, while the row (5) held back