that the Prophet ﷺ, when he sat in prayer (in tashahhud), would place his hands on his knees and raise his right finger next to the thumb, making dua with it, and he would place his left hand on his left knee, spreading it over it.

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا جَلَسَ فِي الصَّلاَةِ وَضَعَ يَدَيْهِ عَلَى رُكْبَتَيْهِ وَرَفَعَ إِصْبَعَهُ الْيُمْنَى الَّتِي تَلِي الإِبْهَامَ فَدَعَا بِهَا وَيَدَهُ الْيُسْرَى عَلَى رُكْبَتِهِ الْيُسْرَى بَاسِطُهَا عَلَيْهَا

When the Messenger of Allah ﷺ sat for tashahhud, he placed his left hand on his left knee and placed his right hand on his right knee, and he formed a ring like (fifty-three) and pointed with his finger of attestation.

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا قَعَدَ فِي التَّشَهُّدِ وَضَعَ يَدَهُ الْيُسْرَى عَلَى رُكْبَتِهِ الْيُسْرَى وَوَضَعَ يَدَهُ الْيُمْنَى عَلَى رُكْبَتِهِ الْيُمْنَى وَعَقَدَ ثَلاَثَةً وَخَمْسِينَ وَأَشَارَ بِالسَّبَّابَةِ

[AI] The Prophet ﷺ used to sit at the end of the prayer and place his left hand on his left knee and his right hand on his right knee and raise his index finger.

أَنَّ النَّبِيَّ ﷺ كَانَ «إِذَا قَعَدَ فِي آخِرِ الصَّلَاةِ وَضَعَ يَدَهُ الْيُسْرَى عَلَى رُكْبَتِهِ الْيُسْرَى وَوَضَعَ يَدَهُ الْيُمْنَى عَلَى رُكْبَتِهِ الْيُمْنَى وَنَصَبَ إِصْبَعَهُ»

[AI] The Prophet ﷺ used to place his left hand on his left knee and his right hand on his right knee when sitting, and he would clasp his fingers and call upon Allah fifty-three times.

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا قَعَدَ يَتَشَهَّدُ وَضَعَ يَدَهُ الْيُسْرَى عَلَى رُكْبَتِهِ الْيُسْرَى وَوَضَعَ يَدَهُ الْيُمْنَى عَلَى رُكْبَتِهِ الْيُمْنَى وَعَقَدَ ثَلَاثًا وَخَمْسِينَ وَدَعَا