Amr bin Shu'ayb narrates from his father, from his grandfather (may Allah be pleased with him), that a Bedouin came to the Prophet (peace and blessings be upon him) and said: I have wealth and I have children, and my father wants to take my wealth. He (peace and blessings be upon him) said: "You and your wealth belong to your father. Your children are your purest earnings."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النفقات / 15749