How Prophet Muhammad Peace and blessings of Allah be upon him Used to receive Revelation from Allah

Ref: Hadith No. 02 Sahi Al Bukhari. 

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ ، قَالَ : أَخْبَرَنَا مَالِكٌ ، عَنْ هِشَامِ بْنِ عُرْوَةَ ، عَنْ أَبِيهِ ، عَنْ عَائِشَةَ أُمِّ الْمُؤْمِنِينَ رَضِيَ اللَّهُ عَنْهَا ، أَنَّ الْحَارِثَ بْنَ هِشَامٍ رَضِيَ اللَّهُ عَنْهُ سَأَل رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، فَقَالَ : يَا رَسُولَ اللَّهِ ، كَيْفَ يَأْتِيكَ الْوَحْيُ ؟ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ :   أَحْيَانًا يَأْتِينِي مِثْلَ صَلْصَلَةِ الْجَرَسِ ، وَهُوَ أَشَدُّهُ عَلَيَّ فَيُفْصَمُ عَنِّي ، وَقَدْ وَعَيْتُ عَنْهُ مَا قَالَ ، وَأَحْيَانًا يَتَمَثَّلُ لِي الْمَلَكُ رَجُلًا فَيُكَلِّمُنِي فَأَعِي مَا يَقُولُ    ، قَالَتْ عَائِشَةُ رَضِيَ اللَّهُ عَنْهَا : وَلَقَدْ رَأَيْتُهُ يَنْزِلُ عَلَيْهِ الْوَحْيُ فِي الْيَوْمِ الشَّدِيدِ الْبَرْدِ فَيَفْصِمُ عَنْهُ ، وَإِنَّ جَبِينَهُ لَيَتَفَصَّدُ عَرَقًا .

Narrated 'Aisha: (the mother of the faithful believers) Al-Harith bin Hisham asked Allah's Apostle   O Allah's Apostle! How is the Divine Inspiration revealed to you?   Allah's Apostle replied,   Sometimes it is (revealed) like the ringing of a bell, this form of Inspiration is the hardest of all and then this state passes off after I have grasped what is inspired. Sometimes the Angel comes in the form of a man and talks to me and I grasp whatever he says.   'Aisha added: Verily I saw the Prophet being inspired divinely on a very cold day and noticed the sweat dropping from his forehead (as the Inspiration was over).