Established Sunnahs of the Prophet:
Uncovering a portion of the body so that rain falls upon it.
On the authority of Anas (may Allah be pleased with him), who said:
"Rain fell upon us while we were with the Messenger of Allah (peace and blessings of Allah be upon him).
He said:
The Messenger of Allah (peace and blessings of Allah be upon him) lifted a portion of his garment,
until the rain touched his body.
So we asked:
'O Messenger of Allah,
why did you do this?'
He replied:
'Because it has only recently come from its Lord.'"
Narrated by Ahmad.
"He lifted his garment,"
meaning he uncovered a portion of his body.