The adhān is a stressed sunna for the five [daily prayers] and Friday only … without echoing (tarjīʿ); and in the Fajr adhān, after “al-falāḥ,” “Prayer is better than sleep” is added twice.
تحفة الملوكZayn al-Dīn al-Rāzīفصل في الأذان
Chapter on the adhān
The iqāma is like it, with the addition: “The prayer has begun” twice after “al-falāḥ.”
He prolongs the adhān (tarassul) and hastens the iqāma; he faces the qibla in both; turns right and left; and raises his voice in both.
ويسْتَحَبّ الوضوء فيهما، ويكرهان للجنب، ويعاد الأذان خاصّة، وتكره إقامة المحدث.
Wuḍūʾ is recommended in both; they are disliked for one in major ritual impurity (junub); the adhān is repeated specifically; iqāma by one in minor impurity (ḥadath) is disliked.
ويؤذِّن للفائتة الأولى ويقيم، وله الاكتفاء بالإقامة في الباقي.
He gives adhān for the first missed [cycle] and iqāma; he may suffice with iqāma for the rest.
وتجوز إقامة غير المؤذِّن.
Iqāma by someone other than the muʾadhdhin is valid.
ويكْره للمؤذِّن أخذ الأجرة.
It is disliked for the muʾadhdhin to take a wage [for the adhān].
ولا يؤذن لصلاة قبل دخولِِ الوقتِ، ويعاد فيه.
He does not call adhān for a prayer before the time enters; if he does, it is repeated.
ويجب على سامع الأذان والإقامة متابعة المؤذِّن، إلا في الحيعلة الأولى فيقول: لا حول ولا قوة إلا بالله العلي العظيم، وفي الثانية: ما شاء الله كان وما لم يشأ لم يكن، وعند قوله: الصّلاة خيرٌ من النوم؛ صدقت وبالحقِّ نَطَقَت.
It is obligatory on one who hears the adhān and iqāma to follow the muʾadhdhin, except in the first “ḥayʿala”: he says “There is no might nor power except with Allah, the Most High, the Tremendous”; in the second: “What Allah wills is, and what He does not will is not”; and when he says “Prayer is better than sleep,” he says “You have spoken truly and spoken rightly.”
ولا يتكلَّم سامعهما، ولا يقرأ، ولا يسَلِّم، ولا يَردّ، ولا يشتغل بعمل غيرَ الإجابة، ويَقطع القراءةَ لهما، والله أعلم.
One who hears them does not speak, recite, give salām, respond [to greeting], or busy himself with anything other than answering [the adhān]; he cuts off recitation for their sake—and Allah knows best.