It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever passes his hand over the head of an orphan, doing so only for the sake of Allah, will have good deeds for every hair his hand passes over. And whoever treats well an orphan in his care, he and I will be in Paradise (as close) as these two (fingers)." And he (peace and blessings be upon him) joined his two fingers together to show it.
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7790