Musnad Abu Ya'la al-Mawsili 152:58

Muhammad ibn Abi Bakr narrated to us, Yahya narrated to us, from Shu'bah, from Simak, from 'Abd al-Rahman ibn 'Abd Allah, from his father, from the Prophet (may Allah bless him and grant him peace), who said: "May Allah make radiant a man who heard a hadith from us, then memorized it until he conveys it."