Musannaf Ibn Abi Shayba 3:3590

Waki’ narrated to us, from Ja’far ibn Burqan, from Maymun, from Ibn ‘Umar, who said: I memorized from the Messenger of Allah, may Allah bless him and grant him peace, four rak’ahs before Dhuhr, and two rak’ahs after it, and two rak’ahs after Maghrib, and two rak’ahs after ‘Isha. And Hafsa narrated to me two rak’ahs before Fajr.