Umm Habiba, the wife of the Messenger of Allah ( صلی اللہ علیہ وسلم ), reported Allah's Messenger ( صلی اللہ علیہ وسلم ) as saying:
If any Muslim servant (of Allah) prays for the sake of Allah twelve rak'ahs (of Sunan) every day, over and above the obligatory ones, Allah will build for him a house in Paradise, or a house will be built for him in Paradise; and I have not abandoned observing them after (hearing it from the Messenger of Allah). (So said also 'Amr and Nu'man.)