I said that I should look at the prayer of the Messenger of Allah ﷺ how he prays. The Messenger of Allah ﷺ stood up and faced the qiblah (i.e. the direction of Ka'bah) and uttered the takbir (Allah is most great); then he raised his hands till he brought them in front of his ears; then he caught hold of his left hand with his right hand (i.e. folded his hands). When he was about to bow, he raised them (his hands) in a like manner. Then he sat, stretched out his left foot (to sit on it), placed his left hand on his left thigh, and kept away the tip of his right elbow from his right thigh, joined two fingers, formed a ring, to do so. And the narrator Bishr made a ring with the thumb and the middle finger.  

قُلْتُ لأَنْظُرَنَّ إِلَى صَلاَةِ رَسُولِ اللَّهِ ﷺ كَيْفَ يُصَلِّي فَقَامَ رَسُولُ اللَّهِ ﷺ فَاسْتَقْبَلَ الْقِبْلَةَ فَكَبَّرَ فَرَفَعَ يَدَيْهِ حَتَّى حَاذَتَا بِأُذُنَيْهِ ثُمَّ أَخَذَ شِمَالَهُ بِيَمِينِهِ فَلَمَّا أَرَادَ أَنْ يَرْكَعَ رَفَعَهُمَا مِثْلَ ذَلِكَ قَالَ ثُمَّ جَلَسَ فَافْتَرَشَ رِجْلَهُ الْيُسْرَى وَوَضَعَ يَدَهُ الْيُسْرَى عَلَى فَخِذِهِ الْيُسْرَى وَحَدَّ مِرْفَقَهُ الأَيْمَنَ عَلَى فَخِذِهِ الْيُمْنَى وَقَبَضَ ثِنْتَيْنِ وَحَلَّقَ حَلَقَةً وَرَأَيْتُهُ يَقُولُ هَكَذَا وَحَلَّقَ بِشْرٌ الإِبْهَامَ وَالْوُسْطَى وَأَشَارَ بِالسَّبَّابَةِ  

"A Sunnah of the prayer is that you should raise your right foot, and make your left foot lie (on the ground)."  

أَنْ تَنْصِبَ رِجْلَكَ الْيُمْنَى وَتَثْنِيَ رِجْلَكَ الْيُسْرَى  

"I heard Al-Qasim saying: "Abdullah bin 'Abdullah informed me that he heard 'Abdullah bin 'Umar saying: "From the Sunnah of the prayer is to lay your left foot on the ground, and raise your right foot."  

أَنْ تُضْجِعَ رِجْلَكَ الْيُسْرَى وَتَنْصِبَ الْيُمْنَى  

Hammad bin Zaid also said (the wording): "From the Sunnah" (narrating) from Yahya just as Jarir did.  

جَرِيرٌ  

(There is another chain) from Yahya bin Sa'eed that Al-Qasim bin Muhammad saw them sitting in Tashah-hud, so he mentioned the Hadith.  

أَنَّ الْقَاسِمَ بْنَ مُحَمَّدٍ أَرَاهُمُ الْجُلُوسَ فِي التَّشَهُّدِ فَذَكَرَ الْحَدِيثَ  

"When the Prophet ﷺ would sit in the prayer, he would place his left foot horizontally - so much so that the upper-part of his foot became black."  

كَانَ النَّبِيُّ ﷺ إِذَا جَلَسَ فِي الصَّلاَةِ افْتَرَشَ رِجْلَهُ الْيُسْرَى حَتَّى اسْوَدَّ ظَهْرُ قَدَمِهِ