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 this is the hardest on me. When it departs I remember what he said. And sometimes the Angel appears to me in the form of a man and speaks to me, and I remember what he said." Aishah said: "I saw him when the Revelation came to him on a very cold day, and his forhead was dripping with sweat."
Sunan an-Nasa'i Book 11, Hadith 59
← Previous Hadith "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.'"

Sunan an-Nasa'i Book 11, Hadith 58 Next Hadith → Concerning the saying of Allah, the Mighty and Sublime: "Move not your tongue concerning to make haste therewith. It is for Us to collect it and to give you the ability to recite it- "The Prophet (ﷺ) used to suffer a great deal of hardship when the Revelation came to him, and he used to move his lips. Allah said: Move not your tongue concerning to make haste therewith. It is for Us to collect it and to give you the ability to recite it." He said: " (This means) He will gather it in your heart, then you will recite it," And when We have recited it to you, then follow the recitation. He said: "So listen to it and remain silent. So when Jibril came to him, the Messenger of Allah (ﷺ) listened, and when he left, he would recite it as he had taught him."

Sunan an-Nasa'i Book 11, Hadith 60