عَنْ عَلِيِّ بْنِ عَبْدِ الرَّحْمَنِ الْمُعَاوِيِّ أَنَّهُ قَالَ: رَآنِي عَبْدُ اللَّهِ بْنُ عُمَرَ وَأَنَا أَعْبَثُ بِالْحَصَى فِي الصَّلَاةِ، فَلَمَّا انْصَرَفَ نَهَانِي، وَقَالَ: اصْنَعْ كَمَا كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يَصْنَعُ، قُلْتُ: وَكَيْفَ كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يَصْنَعُ؟ قَالَ: كَانَ رَسُولُ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ إِذَا جَلَسَ فِي الصَّلَاةِ وَضَعَ كَفَّهُ الْيُمْنَى عَلَى فَخِذِهِ الْيُمْنَى وَقَبَضَ أَصَابِعَهُ كُلَّهَا وَأَشَارَ بِإِصْبَعِهِ الَّتِي تَلِي الْإِبْهَامَ وَوَضَعَ كَفَّهُ الْيُسْرَى عَلَى فَخِذِهِ الْيُسْرَى
Ali bin Abdur Rahman Muawi says: Sayyiduna Abdullah bin Umar (may Allah be pleased with him) saw me playing with pebbles during prayer. When he finished, he forbade me from doing so and said: Do as the Messenger of Allah (peace and blessings be upon him) used to do. I asked: How did the Messenger of Allah (peace and blessings be upon him) use to do? He said: When the Messenger of Allah (peace and blessings be upon him) would sit in prayer, he would place his right palm on his right thigh and close all the fingers, and point with the finger next to the thumb, and place the left palm on the left thigh.