Sunan Abi Dawud, Hadith 4700

Anas said : A man asked : where is my father, Messenger of Allah? He replied! Your father is in Hell. When he turned his back, he said : My father and your father are in Hell.

حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا حَمَّادٌ، عَنْ ثَابِتٍ، عَنْ أَنَسٍ، أَنَّ رَجُلاً، قَالَ يَا رَسُولَ اللَّهِ أَيْنَ أَبِي قَالَ ‏"‏ أَبُوكَ فِي النَّارِ ‏"‏ ‏.‏ فَلَمَّا قَفَّى قَالَ ‏"‏ إِنَّ أَبِي وَأَبَاكَ فِي النَّارِ ‏"‏ ‏.‏

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also referenced under: Hadith 4718 (DarusSalam)