The Messenger of Allah ﷺ said, "Whoever consistently observes twelve units of voluntary prayer will have a house built for him in Paradise. Four units before Dhuhr, two units after Dhuhr, two units after Maghrib, two units after Isha, and two units before Fajr."
حدثنا أبو بكر بن أبي شيبة حدثنا إسحق بن سليمان أبو يحيى الرازي عن مغيرة بن زياد عن عطاء
قال رسول الله ﷺ من ثابر على ثنتي عشرة ركعة من السنة بني له بيت في الجنة أربع قبل الظهر وركعتين بعد الظهر وركعتين بعد المغرب وركعتين بعد العشاء وركعتين قبل الفجر
[Its isnad is hasan] Narrated by Tirmidhi, Book of Prayer, chapter on what has been said about one who prays twelve rakat during the day and night as part of the sunnah, no. 414, from the hadith of Ishaq bin Sulayman with this wording, and he said, "Gharib." Nasai graded it daif. Mughira was deemed reliable by the majority, and the hadith has corroborating narrations in Muslim, no. 728, and elsewhere.