Musannaf Ibn Abi Shayba 33:1396

Al-Fadl ibn Dukayn narrated to us, he said: Fitr narrated to us, from Mundhir, from al-Rabi’ ibn Khuthaym, that a beggar came to him. He said: "Feed him sugar." His family said: "What will he do with sugar?" He said: "But I do something with it."