2ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ إِسْمَاعِيلَ بْنِ مَرَّارٍ قَالَ كَتَبَ الْحَسَنُ بْنُ الْعَبَّاسِ الْمَعْرُوفِيُّ إِلَى الرِّضَا (عَلَيْهِ السَّلام) جُعِلْتُ فِدَاكَ أَخْبِرْنِي مَا الْفَرْقُ بَيْنَ الرَّسُولِ وَالنَّبِيِّ وَالامَامِ قَالَ فَكَتَبَ أَوْ قَالَ الْفَرْقُ بَيْنَ الرَّسُولِ وَالنَّبِيِّ وَالامَامِ أَنَّ الرَّسُولَ الَّذِي يُنْزَلُ عَلَيْهِ جَبْرَئِيلُ فَيَرَاهُ وَيَسْمَعُ كَلامَهُ وَيُنْزَلُ عَلَيْهِ الْوَحْيُ وَرُبَّمَا رَأَى فِي مَنَامِهِ نَحْوَ رُؤْيَا إِبْرَاهِيمَ (عَلَيْهِ السَّلام) وَالنَّبِيُّ رُبَّمَا سَمِعَ الْكَلامَ وَرُبَّمَا رَأَى الشَّخْصَ وَلَمْ يَسْمَعْ وَالامَامُ هُوَ الَّذِي يَسْمَعُ الْكَلامَ وَلا يَرَى الشَّخْصَ.
2. Ali ibn Ibrahim has narrated from his father from Isma‘il ibn Marrar who has said the following “Al-Hassan ibn al-‘Abbass al-Ma‘rufi wrote to Imam al-Rida 
. “May Allah take my soul in service for your cause, explain to me the difference between the messengers, the prophets and the Imams.” The Imam said or wrote, “ The difference between the messengers, the prophets and the Imams is that a messenger is one to whom Jibril (Gabriel) comes. He sees Jibril and hears his speech and Jibril (the angel) brings him (Divine) revelation and sometimes he may see in his dream like the dream of Abraham . A prophet is one who may hear the speech and may see the person or may not hear. The Imam is the one who hears the speech but does not see the person.”
