"Al-Harith bin Hisham asked the Messenger of Allah ﷺ: 'How does the Revelation come to you?' He said: 'Like the ringing of a bell, and when it departs I remember what he (the Angel) said, and this is the hardest on me. And sometimes he (the Angel) comes to me in the form of a man and gives it to me.'" (Using translation from Nasāʾī 933)
سَأَلَ الْحَارِثُ بْنُ هِشَامٍ رَسُولَ اللهِ ﷺ كَيْفَ يَأْتِيكَ الْوَحْيُ؟ قَالَ فِي مِثْلِ صَلْصَلَةِ الْجَرَسِ فَيَفْصِمُ عَنِّي وَقَدْ وَعِيتُ عَنْهُ مَا قَالَ وَهُوَ أَشَدُّهُ عَلَيَّ وَأَحْيَانًا يَأْتِينِي فِي مِثْلِ صُورَةِ الْفَتَى فَيَنْبِذُهُ إِلَيَّ