The Prophet ﷺ said, "Whoever prays twelve units of voluntary prayer during the day and night, a house will be built for him in Paradise."
أخبرنا محمد بن إسمعيل بن إبراهيم قال حدثنا يزيد بن هارون قال أنبأنا إسمعيل عن المسيب بن رافع عن عنبسة بن أبي سفيان
عن النبي ﷺ قال من صلى في اليوم والليلة ثنتي عشرة ركعة بني له بيت في الجنة
[Sahih] Ibn Majah reported it in the Book of Establishing Prayers, chapter on what has been said about twelve rakats being from the sunnah, hadith no. 1141, from the hadith of Yazid bin Harun with this wording. It is also found in al-Kubra, hadith no. 1474. Nasai said, Yaala bin Ubayd differed with him and reported the hadith as stopped. It has corroborating narrations in Muslim, no. 728, and elsewhere.