ثنا أَيُّوبُ بْنُ إِسْحَاقَ ، نَا أَبُو مَعْمَرٍ ، عَنْ عَبْدِ الْوَارِثِ بْنِ سَعِيدٍ ، قَالَ : سَأَلْتُ أَبَا حَنِيفَةَ ، أَوْ سُئِلَ أَبُو حَنِيفَةَ ، عَنِ الْوِتْرِ ، فَقَالَ : " فَرِيضَةٌ ، فَقُلْتُ : أَوْ فَقِيلَ لَهُ : فَكَمِ الْفَرْضُ ؟ قَالَ : خَمْسُ صَلَوَاتٍ ، فَقِيلَ لَهُ : فَمَا تَقُولُ فِي الْوِتْرِ ؟ قَالَ : فَرِيضَةٌ ، فَقُلْتُ أَوْ فَقِيلَ لَهُ : أَنْتَ لا تُحْسِنُ الْحِسَابَ "
Abdul Warith bin Saeed narrates that I asked Imam Abu Hanifa, or Imam Abu Hanifa was asked, about Witr. He replied that Witr is obligatory (fard). So I said, or it was said to him, how many obligatory prayers are there? He replied that there are five prayers. Then it was said to him, so what do you say about Witr? He replied that it is obligatory (fard). So I said, or it was said to him, that you do not know how to count.