(351) بَابُ قَوْلِ الرَّجُلِ: يَا بُنَيَّ، لِمَنْ أَبُوهُ لَمْ يُدْرِكِ الإسْلامَ
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 myfather had not become Muslim. He began to say, 'My son, my son.'"
Reference: Al-Adab Al-Mufrad 806
In-book reference: Book 33, Hadith 53
English translation: Book 33, Hadith 806