Hadith on Revelation Narrated Aisha(R.A)

Narrated `Aisha(R.A):
(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 what he says." `Aisha(R.A) 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).
Sahi Bukhari 1.2