It wasnarrated that Abu Hurairah said:
"Ja'far bin Abu Talib used tolike the poor; he would sit with them and talk to them, and theywouldtalk to him. And the Messenger of Allah (ﷺ) gave him theKunyah ofAbul-Masakin (Father of the Poor)." (ID)
English reference (ID): Vol. 5, Book 37, Hadith 4125 (ID)
Arabic reference (ID): Book 37, Hadith 4264 (ID)