It was
narrated that ‘Asim bin ‘Amr said:
“A group from the people of
‘Iraq came to ‘Umar and when they came to him, he said to them:
‘Where
are you from?’ They said: ‘From the inhabitants of
‘Iraq.’ He said:
‘Have you come with permission?’ They said:
‘Yes.’ Then they asked him
about a man’s prayer in his house.
‘Umar said: ‘I asked the Messenger
of Allah (ﷺ) and he said:
“As for a man’s prayer in his house, it is
light, so illuminate
your houses.’””
Another chain with similar wording.