Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
abudawud:1358Qutaybah > ʿAbd al-ʿAzīz b. Muḥammad > ʿAbd al-Majīd > Yaḥyá b. ʿAbbād > Saʿīd b. Jubayr > Ibn ʿAbbās

He (the Prophet) got up and prayed eight rak'ahs in pairs, and then observed witr with five rak'ahs and he did not sit between them.  

أبو داود:١٣٥٨حَدَّثَنَا قُتَيْبَةُ حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ مُحَمَّدٍ عَنْ عَبْدِ الْمَجِيدِ عَنْ يَحْيَى بْنِ عَبَّادٍ عَنْ سَعِيدِ بْنِ جُبَيْرٍ أَنَّ ابْنَ عَبَّاسٍ حَدَّثَهُ فِي هَذِهِ الْقِصَّةِ قَالَ

فَقَامَ فَصَلَّى رَكْعَتَيْنِ رَكْعَتَيْنِ حَتَّى صَلَّى ثَمَانِيَ رَكَعَاتٍ ثُمَّ أَوْتَرَ بِخَمْسٍ لَمْ يَجْلِسْ بَيْنَهُنَّ