Sahih Muslim Book - 5, Hadith - 1308

حَدَّثَنَا قُتَيْبَةُ حَدَّثَنَا لَيْثٌ عَنِ ابْنِ عَجْلاَنَ ح قَالَ وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِى شَيْبَةَ - وَاللَّفْظُ لَهُ - قَالَ حَدَّثَنَا أَبُو خَالِدٍ الأَحْمَرُ عَنِ ابْنِ عَجْلاَنَ عَنْ عَامِرِ بْنِ عَبْدِ اللَّهِ بْنِ الزُّبَيْرِ عَنْ أَبِيهِ قَالَ كَانَ رَسُولُ اللَّهِ -صلى الله عليه وسلم- إِذَا قَعَدَ يَدْعُو وَضَعَ يَدَهُ الْيُمْنَى عَلَى فَخِذِهِ الْيُمْنَى وَيَدَهُ الْيُسْرَى عَلَى فَخِذِهِ الْيُسْرَى وَأَشَارَ بِإِصْبَعِهِ السَّبَّابَةِ وَوَضَعَ إِبْهَامَهُ عَلَى إِصْبَعِهِ الْوُسْطَى وَيُلْقِمُ كَفَّهُ الْيُسْرَى رُكْبَتَهُ.

It was narrated from 'Amir bin 'Abdullah bin Az-Zubair that his father said: "When the Messenger of Allah (s.a.w) sat to supplicate in (Tashah-hud), he would place his right hand on his right thigh, and his left hand on his left thigh, and he would point with his index finger, placing the thumb on the middle finger, and spread his left hand on his left knee."