وَ سَأَلَ مُعَاوِيَةُ بْنُ وَهْبٍ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ: عَنِ اَلْأَذَانِ فَقَالَ «اِجْهَرْ وَ اِرْفَعْ بِهِ صَوْتَكَ فَإِذَا أَقَمْتَ فَدُونَ ذَلِكَ وَ لاَ تَنْتَظِرْ بِأَذَانِكَ وَ إِقَامَتِكَ إِلاَّ دُخُولَ وَقْتِ اَلصَّلاَةِ وَ اُحْدُرْ إِقَامَتَكَ حَدْراً.
Muawiya ibn Wahb asked Imam Jafar ibn Muhammad Al-Sadiq (a.s) about the adhan (call to prayer). The Imam said: "Raise your voice and speak loudly when giving the adhan. When performing the iqamah (second call to prayer), use a slightly lower voice. Do not delay your adhan and iqamah except until the time for prayer has arrived, and recite the iqamah quickly (with fluidity)."