Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with them both) said: A man came to the Prophet (peace and blessings be upon him) and said: I pledge allegiance to you on emigration or jihad, hoping for reward from Allah Almighty for it. He (peace and blessings be upon him) asked: "Is either of your parents alive?" He said: Yes, both are alive. He (peace and blessings be upon him) said: "Do you hope for reward from Allah Almighty?" He said: Yes. He (peace and blessings be upon him) said: "Go back to them and treat them well."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17829