When Sayyiduna Talhah bin al-Bara' (may Allah be pleased with him) met the Prophet (peace and blessings be upon him), he said to him (peace and blessings be upon him): "Command me whatever you like; I will not disobey you in any matter." The Prophet (peace and blessings be upon him) was amazed at this, as he was still young, and he (peace and blessings be upon him) said to him: "Kill your father!" When he turned away to carry it out, he (peace and blessings be upon him) called him back and said: "I have not been sent to sever ties of kinship."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17834