When the Messenger of Allah ﷺ sat during the prayer, he put his hands on his knees and raised the finger that is next to the thumb, and supplicates with it, and his left hand was on his knee laid on it.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا جَلَسَ فِي الصَّلاَةِ وَضَعَ يَدَيْهِ عَلَى رُكْبَتَيْهِ وَرَفَعَ أُصْبُعَهُ الَّتِي تَلِي الإِبْهَامَ فَدَعَا بِهَا وَيَدَهُ الْيُسْرَى عَلَى رُكْبَتِهِ بَاسِطُهَا عَلَيْهَا  

That the Prophet ﷺ used to point with his finger when he supplicated, but he did not move it. Ibn Jurayj said: "And 'Amr added: 'Amir bin 'Abdullah bin Az-Zubair told me that his father saw the Prophet ﷺ supplicating like that, putting his weight on his left arm, leaning on his left leg.'"  

أَنَّ النَّبِيَّ ﷺ كَانَ يُشِيرُ بِأُصْبُعِهِ إِذَا دَعَا وَلاَ يُحَرِّكُهَا قَالَ ابْنُ جُرَيْجٍ وَزَادَ عَمْرٌو قَالَ أَخْبَرَنِي عَامِرُ بْنُ عَبْدِ اللَّهِ بْنِ الزُّبَيْرِ عَنْ أَبِيهِ أَنَّهُ رَأَى النَّبِيَّ ﷺ يَدْعُو كَذَلِكَ وَيَتَحَامَلُ بِيَدِهِ الْيُسْرَى عَلَى رِجْلِهِ الْيُسْرَى