Mishkat al-Masabih
He said that he saw the Prophet (ﷺ) praying, and when he had prayed an odd number of rak'as he did not stand up till after he had adopted a sitting position. Bukhari transmitted it.
وَعَنْهُ أَنَّهُ رَأَى النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُصَلِّي فَإِذَا كَانَ فِي وِتْرٍ مِنْ صَلَاتِهِ لَمْ يَنْهَضْ حَتَّى يَسْتَوِيَ قَاعِدًا. رَوَاهُ البُخَارِيّ
Reference