‘Abd Allah b. ‘Umar saw me playing with pebbles during prayer. When he finished his prayer, he forbade me (to do so) and said: Do as the Apostle ﷺ used to do. I asked him: How would the Messenger of Allah ﷺ do? He said: When he sat during the prayer (for reciting the tashahhud), he placed his right hand on his right thigh, and clenched all his fingers, and pointed with the finger which is adjacent to the thumb, and he placed his left hand on his left thigh.  

وَقَالَ اصْنَعْ كَمَا كَانَ رَسُولُ اللَّهِ ﷺ يَصْنَعُ فَقُلْتُ وَكَيْفَ كَانَ رَسُولُ اللَّهِ ﷺ يَصْنَعُ قَالَ كَانَ إِذَا جَلَسَ فِي الصَّلاَةِ وَضَعَ كَفَّهُ الْيُمْنَى عَلَى فَخِذِهِ الْيُمْنَى وَقَبَضَ أَصَابِعَهُ كُلَّهَا وَأَشَارَ بِأُصْبُعِهِ الَّتِي تَلِي الإِبْهَامَ وَوَضَعَ كَفَّهُ الْيُسْرَى عَلَى فَخِذِهِ الْيُسْرَى  

When the Messenger of Allah ﷺ sat during the prayer( at the tashahhud), he placed his left foot under his right thigh and shin and spread his right foot and placed his left hand on his left knee and placed his right hand on his right thigh, and he pointed with his forefinger.  

كَانَ رَسُولُ اللَّهِ ﷺ إِذَا قَعَدَ فِي الصَّلاَةِ جَعَلَ قَدَمَهُ الْيُسْرَى تَحْتَ فَخِذِهِ الْيُمْنَى وَسَاقِهِ وَفَرَشَ قَدَمَهُ الْيُمْنَى وَوَضَعَ يَدَهُ الْيُسْرَى عَلَى رُكْبَتِهِ الْيُسْرَى وَوَضَعَ يَدَهُ الْيُمْنَى عَلَى فَخِذِهِ الْيُمْنَى وَأَشَارَ بِأُصْبُعِهِ وَأَرَانَا عَبْدُ الْوَاحِدِ وَأَشَارَ بِالسَّبَّابَةِ  

The Prophet ﷺ used to point with his finger (at the end of the tashahhud) and he would not move it. Ibn Juraij said: "And 'Amr bin Dinar added: 'He (Ziyad) said: "'Amir informed me from his father that he saw the Prophet ﷺ supplicating like that. And the Prophet ﷺ would brace himself with his left hand on his left knee.  

أَنَّ النَّبِيَّ ﷺ كَانَ يُشِيرُ بِأُصْبُعِهِ إِذَا دَعَا وَلاَ يُحَرِّكُهَا قَالَ ابْنُ جُرَيْجٍ وَزَادَ عَمْرُو بْنُ دِينَارٍ قَالَ أَخْبَرَنِي عَامِرٌ عَنْ أَبِيهِ أَنَّهُ رَأَى النَّبِيَّ ﷺ يَدْعُو كَذَلِكَ وَيَتَحَامَلُ النَّبِيُّ ﷺ بِيَدِهِ الْيُسْرَى عَلَى فَخِذِهِ الْيُسْرَى  

He kept his look fixed on the finger he was pointing.  

لاَ يُجَاوِزُ بَصَرُهُ إِشَارَتَهُ وَحَدِيثُ حَجَّاجٍ أَتَمُّ  

I saw the Prophet (peace be upon him placing his right hand on his right thigh and raising his forefinger curving it a little.  

رَأَيْتُ النَّبِيَّ ﷺ وَاضِعًا ذِرَاعَهُ الْيُمْنَى عَلَى فَخِذِهِ الْيُمْنَى رَافِعًا أُصْبُعَهُ السَّبَّابَةَ قَدْ حَنَاهَا شَيْئًا