He who observed twelve voluntary rak'ahs, a house will be built for him in Paradise.
Sahih Muslim Book 6, Hadith 125
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A house will be built in Paradise, for anyone who prays in a day and a night twelve rak'ahs; and she added: I have never abandoned (observing them) since I heard it from the Messenger of Allah (ﷺ). Some of the other narrators said the same words: I have never abandoned (observing them) since I heard (from so and so).
Sahih Muslim Book 6, Hadith 124 Next Hadith → 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.)
Sahih Muslim Book 6, Hadith 126
Sahih Muslim Book 6, Hadith 124 Next Hadith → 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.)
Sahih Muslim Book 6, Hadith 126