Musannaf Ibn Abi Shayba 3:3605

Muhammad ibn Sulayman al-Asbahani narrated to us, from Suhayl, from his father, from Abu Hurayrah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever prays twelve rak'ahs in a day, a house will be built for him in Paradise: two rak'ahs before the dawn, two rak'ahs before the noon (Dhuhr), two rak'ahs after the noon, two rak'ahs—I think he said—before the afternoon (Asr), two rak'ahs after the sunset (Maghrib), and—I think he said—two rak'ahs after the night (Isha)."