"I heard Yusuf-meaning Ibn Mahak- narrating that Hakim said: 'I gave my pledge of allegiance to the Messenger of Allah ﷺ, pledging that I would go down (in prostration) only after standing up from bowing.'"  

بَايَعْتُ رَسُولَ اللَّهِ ﷺ أَنْ لاَ أَخِرَّ إِلاَّ قَائِمًا