Muwatta Imam Malik Book of The Qur'an, Hadith 7

Yahya related to me from Malik from Hisham ibn Urwa from his father from A'isha, the wife of the Prophet ﷺ that al-Harith ibn Hisham asked the Messenger of Allah ﷺ "How does the revelation come to you?" and the Messenger of Allah ﷺ said, "Sometimes it comes to me like the ringing of a bell, and that is the hardest for me, and when it leaves me I remember what it has said. And sometimes the angel appears to me in the likeness of a man and talks to me and I remember what he says."
A'isha added, "I saw it coming down on him on an intensely cold day, and when it had left him his forehead was dripping with sweat."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، زَوْجِ النَّبِيِّ ﷺ أَنَّ الْحَارِثَ بْنَ هِشَامٍ سَأَلَ رَسُولَ اللَّهِ كَيْفَ يَأْتِيكَ الْوَحْىُ فَقَالَ رَسُولُ اللَّهِ ﷺ " أَحْيَانًا يَأْتِينِي فِي مِثْلِ صَلْصَلَةِ الْجَرَسِ وَهُوَ أَشَدُّهُ عَلَىَّ فَيَفْصِمُ عَنِّي وَقَدْ وَعَيْتُ مَا قَالَ وَأَحْيَانًا يَتَمَثَّلُ لِيَ الْمَلَكُ رَجُلاً فَيُكَلِّمُنِي فَأَعِي مَا يَقُولُ " . قَالَتْ عَائِشَةُ وَلَقَدْ رَأَيْتُهُ يَنْزِلُ عَلَيْهِ فِي الْيَوْمِ الشَّدِيدِ الْبَرْدِ فَيُفْصِمُ عَنْهُ وَإِنَّ جَبِينَهُ لَيَتَفَصَّدُ عَرَقًا .