حَدَّثَنَا حَفْصُ بْنُ عُمَرَ النَّمَرِيُّ، حَدَّثَنَا شُعْبَةُ، عَنْ سُلَيْمَانَ، عَنْ عُمَارَةَ بْنِ عُمَيْرٍ، عَنْ أَبِي مَعْمَرٍ، عَنْ أَبِي مَسْعُودٍ الْبَدْرِيِّ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ لاَ تُجْزِئُ صَلاَةُ الرَّجُلِ حَتَّى يُقِيمَ ظَهْرَهُ فِي الرُّكُوعِ وَالسُّجُودِ ‏"‏ ‏.‏

This tradition has also been transmitted by Rifa’ah b Rafi through a different chain of narrators. This version has

When you get up to pray, say the takbir, exalting Allah; then recite the Qur’an as much as it is convenient for you. The version adds: When you sit in the middle of the prayer, do it completely(so that you are at rest) and spread your left thigh; then recite the tashahhud. Then if you get up (again), do in a similar way until you finish your prayer.