Anas b. Malik reported that a person said:Allah's Messenger, who is my father? And he said: Your father is so and so, and there was revealed this verse:" Do not ask about matters which, if they were to be made manifest to you, might cause you harm" (v. 101).
وَحَدَّثَنَا مُحَمَّدُ بْنُ مَعْمَرِ بْنِ رِبْعِيٍّ الْقَيْسِيُّ، حَدَّثَنَا رَوْحُ بْنُ عُبَادَةَ، حَدَّثَنَا شُعْبَةُ، أَخْبَرَنِي مُوسَى بْنُ أَنَسٍ، قَالَ سَمِعْتُ أَنَسَ بْنَ مَالِكٍ، يَقُولُ قَالَ رَجُلٌ يَا رَسُولَ اللَّهِ مَنْ أَبِي قَالَ " أَبُوكَ فُلاَنٌ " . وَنَزَلَتْ { يَا أَيُّهَا الَّذِينَ آمَنُوا لاَ تَسْأَلُوا عَنْ أَشْيَاءَ إِنْ تُبْدَ لَكُمْ تَسُؤْكُمْ} تَمَامَ الآيَةِ .
Muslim
The Book of Virtues • Hadith 178