وَ رَوَى مَنْصُورُ بْنُ حَازِمٍ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ أَنَّهُ قَالَ: «هَبَطَ جَبْرَئِيلُ عَلَيْهِ اَلسَّلاَمُ بِالْأَذَانِ عَلَى رَسُولِ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ وَ كَانَ رَأْسُهُ فِي حَجْرِ عَلِيٍّ عَلَيْهِ اَلسَّلاَمُ فَأَذَّنَ جَبْرَئِيلُ عَلَيْهِ اَلسَّلاَمُ وَ أَقَامَ فَلَمَّا اِنْتَبَهَ رَسُولُ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ قَالَ «يَا عَلِيُّ سَمِعْتَ» قَالَ «نَعَمْ يَا رَسُولَ اَللَّهِ » قَالَ «حَفِظْتَ» قَالَ «نَعَمْ» قَالَ «اُدْعُ بِلاَلاً فَعَلِّمْهُ فَدَعَا بِلاَلاً فَعَلَّمَهُ».
Mansur ibn Hazim narrated from Imam Jafar ibn Muhammad Al-Sadiq (a.s) that He said: "Archangel Jibril (a.s) descended with the adhan (call to prayer) upon Messenger of Allah (saws) while his head was resting in the lap of Imam Ali (a.s). Archangel Jibril (a.s) pronounced the adhan and the iqamah (second call to prayer). When the Messenger of Allah (saws) awoke, He said: 'O’ Ali, did you hear?' Imam (a.s) replied: 'Yes, O’ Messenger of Allah (saws).' He (saws) said: 'Did you memorize it?' Imam (a.s) replied: 'Yes.' The Prophet (saws) then said: 'Call Bilal and teach him,' So Imam Ali (a.s) called Bilal and taught him."