As-Sa'b ibn Hakim reported that his grandfather said, "I came to 'Umar ibn al-Khattab, may Allah be pleased with him. He began to say, 'Nephew.' Then he questioned me and I told him my lineage and so he knew that my father had not become Muslim. He began to say, 'My son, my son.'"
Reference: Al-Adab Al-Mufrad 806 In-book : Book 33, Hadith 53 English translation : Book 33, Hadith 806
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