Al Baraa said:
“While we were with the
Messenger of Allâh (saw) he suddenly looked towards
a group (of people) and said: “For what reason
have they gathered here?” It was said, “In order to
dig a grave”. So the Messenger of Allâh (saw) became
alarmed and startled and he quickly went ahead of
the Companions until he reached the grave, then
he knelt upon it and I turned my face towards him
(saw) in order to see what he was doing. He (saw)
cried until the earth became wet with his tears, then he
turned to us and said, “O my brothers! Prepare for a
day like this”" (al Bukhârî in at-Tarikh, Ibn Mâjah,
Ahmad and others, hasan)