Hadith #3861 (Sunan Ibn Majah)
Book: Zuhd
Narrator(s): Abu Salama bin 'Abdur Rahman أبو سلمة بن عبد الرحمن بن عوف, Muhammad bin Yahya bin Hiban محمد بن يحيى بن حبان, Sfyh bint Jryr صفية بنت جرير

“Ja’far bin Abu Talib used to like the poor; he would sit with them and talk to them, and they would talk to him. And the Messenger of Allah (ﷺ) gave him the Kunyah of Abul-Masakin (Father of the Poor).”

Source: https://parallelquran.com/hadith/sunan-ibn-majah-3861/