Zurarah bin Awfa (may Allah have mercy on him) narrates from a man of his people who was called Malik or Abu Malik; he said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever takes an orphan from between two Muslims into his food and drink until he no longer needs him, Paradise becomes definitely obligatory for him. And any man who lives to see his parents, or one of them, and then enters the Fire, may Allah distance him. And any Muslim man who frees a Muslim slave, that will be his ransom from the Fire."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16717