Musannaf Ibn Abi Shayba 3:3948

Hushaym narrated to us, from Ya'la ibn 'Ata, from al-Walid ibn 'Abd al-Rahman, from Ibn 'Umar, that he said: "O Humran, do not abandon the two rak'ahs before the dawn, for in them are the ragha'ib (great rewards/desires)."