حَدَّثَنَا ابْنُ الْمُثَنَّى، حَدَّثَنَا مُعَاذُ بْنُ مُعَاذٍ، حَدَّثَنَا شُعْبَةُ، حَدَّثَنِي عَبْدُ رَبِّهِ بْنُ سَعِيدٍ، عَنْ أَنَسِ بْنِ أَبِي أَنَسٍ، عَنْ عَبْدِ اللَّهِ بْنِ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ الْحَارِثِ، عَنِ الْمُطَّلِبِ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " الصَّلاَةُ مَثْنَى مَثْنَى أَنْ تَشَهَّدَ فِي كُلِّ رَكْعَتَيْنِ وَأَنْ تَبَاءَسَ وَتَمَسْكَنَ وَتُقْنِعَ بِيَدَيْكَ وَتَقُولَ اللَّهُمَّ اللَّهُمَّ فَمَنْ لَمْ يَفْعَلْ ذَلِكَ فَهِيَ خِدَاجٌ " . سُئِلَ أَبُو دَاوُدَ عَنْ صَلاَةِ اللَّيْلِ مَثْنَى قَالَ إِنْ شِئْتَ مَثْنَى وَإِنْ شِئْتَ أَرْبَعًا .
Narrated Muttalib: The Prophet (PBUH) said: Prayer is to be offered in two rak'ahs; and you should recite the tashahhud at the end of two rak'ahs, and express your distress and humility and raise your hands and say praying: O Allah, O Allah. He who does not do so does not offer a perfect prayer. Abu Dawud was asked about offering prayer at night in two rak'ahs. He said: They may be two if you like and four if you like. Translation Not Available
Book Ref: Sunan Abi Dawud Book 5 Hadith 1296
Web Ref: Sunan Abi Dawud Book 5 Hadith 1291