'O son of Adam, I was sick, but you did not visit Me.'The man will reply,
'O my Lord, how could I visit You - the Lord of the the whole universe?'God will say,
'Did you not know that such and such a man had fallen ill? Yet you did not visit him. Did you not know that had you gone there to visit him, you would have found Me there with him?'
HADITH OF MUSLIM
On the Authority of Abu Hurayrah