Sunan Abu Dawud 844
Prayer (Kitab Al-Salat)
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا هُشَيْمٌ، عَنْ خَالِدٍ، عَنْ أَبِي قِلاَبَةَ، عَنْ مَالِكِ بْنِ الْحُوَيْرِثِ، أَنَّهُ رَأَى النَّبِيَّ صلى الله عليه وسلم إِذَا كَانَ فِي وِتْرٍ مِنْ صَلاَتِهِ لَمْ يَنْهَضْ حَتَّى يَسْتَوِيَ قَاعِدًا .
Abu Qilabah said:Malik b. al-Huwairith saw that the prophet (may peace by upon him) would not stand at the end of the first or the third rak’ah until he sat down straight
Grading: Al-Albani: Sahih · Muhammad Muhyi Al-Din Abdul Hamid: Sahih · Shuaib Al Arnaut: Hasan Sahih · Zubair Ali Zai: Sahih Bukhari (823)
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.