It is narrated from Hazrat Anas (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: Whoever is made responsible for two or three daughters or sisters (and fulfills this responsibility) until they pass away, or he himself passes away, then I and he will be together like these two fingers. Saying this, the Prophet (peace and blessings be upon him) pointed towards his index and middle fingers.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 12498