The Book of Prayers (Kitab Al-Salat)

Muslim :: Book 4 : Hadith 1581

Umm Habiba, the wife of the Apostle of Allah (may peace be upon him), reported Allah's Messenger (may peace be upon him) as saying: If any Muslim servant (of Allah) prays for the sake of Allah twelve rak'ahs (of Sun'an) 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 to observe the in after (hearing it from the Messenger of Allah). (So said also 'Amr and Nu'man.)