A'isha reported that Harith b. Hisham asked Allah's Apostle (ﷺ):
How does the the wahi (inspiration) come to you? He said: At times it comes to me like the ringing of a bell and that is most severe for me and when it is over I retain that (what I had received in the form of wahi), and at times an Angel in the form of a human being comes to me (and speaks) and I retain whatever he speaks.
Reference: Sahih Muslim 2333 b In-book : Book 43, Hadith 117 USC-MSA web (English) : Book 30, Hadith 5765 (deprecated)
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