Musannaf Ibn Abi Shayba 28:365

Al-Fadl ibn Dukayn narrated to us, he said: Fitr narrated to us, he said: I was sitting with Zayd ibn Ali. I said: "How did this man, Umar ibn Abd al-Aziz, treat you?" Then a small son of his passed by, so he said: "May Allah reward him with good, for he has included this one among the two thousand."