Umm Sa'id bint Murrah (may Allah be pleased with her) reports from her father (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "I and the one who looks after an orphan, whether his own or someone else's, will be in Paradise like this," and Sufyan pointed with his finger.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الوصايا / 12665