Musannaf Ibn Abi Shayba 3:3994

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Ibn Abi Dhi’b and al-‘Umari narrated to us, from Nafi’, from Ibn ‘Umar, that the Prophet (peace and blessings of Allah be upon him) used to pray the two rak’ahs after the Maghrib in his house.