It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that a man came to the service of the Noble Prophet (peace and blessings be upon him) and said: O Messenger of Allah! I have committed a very great sin; is there any room for repentance and any way out for me? The Noble Prophet (peace and blessings be upon him) asked him: "Do you have parents?" He said: No! The Noble Prophet (peace and blessings be upon him) asked about his maternal aunt, and he said: She is there. The Noble Prophet (peace and blessings be upon him) said: "Go and treat her kindly."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 4624