Yahya related to me from Malik from Muhammad ibn al-Munkadir and
from Salim ibn Abi'n-Nadr, the mawla of Umar ibn Ubaydullah that Amir
ibn Sad ibn Abi Waqqas heard his father ask Usama ibn Zayd, "Have you
heard anything from the Messenger of Allah, may Allah bless him and
grant him peace, about the plague?" Usama said, "The Messenger of
Allah, may Allah bless him and grant him peace, said, 'The plague is a
punishment that was sent down on a party of the Banu Israil or whoever
was before them. When you hear of it in a land, do not enter it. If it
comes upon a land and you are in it, do not depart in flight from it.'
"
Malik said that Abu'n-Nadr said, "That is, do not depart
with no other intention but flight."
Muwatta Malik Book 45, Hadith 22
Yahya related to me from Malik from Hisham ibn Urwa from his
father from A'isha, the wife of the Prophet, may Allah bless him and
grant him peace, that al-Harith ibn Hisham asked the Messenger of
Allah, may Allah bless him and grant him peace, "How does the
revelation come to you?" and the Messenger of Allah, may Allah bless
him and grant him peace, 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."
Muwatta Malik Book 15, Hadith 8