Sayyiduna Adi bin Hatim (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Whoever takes in an orphan, whether of his own (family) or of someone else, until Allah Almighty makes that orphan self-sufficient, Paradise becomes binding for that person."
Imam Tabarani recorded it in al-Mu'jam al-Awsat; its chain contains a narrator, al-Musayyab bin Sharik, and he is matruk (abandoned).