Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates that the Prophet (peace and blessings be upon him) said: "Whoever gives shelter to one or two orphans, then is patient and hopes for reward, he and I will be in Paradise like these two (fingers)." The Prophet (peace and blessings be upon him) said this while turning his index finger and middle finger.
Imam Tabarani recorded it in al-Mu'jam al-Awsat, and its chain contains narrators whom I do not know.