He saw a man moving pebbles with his hand while praying. When he finished, 'Abdullah said to him: "Do not move the pebbles while you are praying, for that is from Shaitan. Rather do what the Messenger of Allah ﷺ used to do." He said: "What did he used to do?" He said: "He would put his right hand on his right thigh, and point with the finger that is next to the thumb toward the Qiblah, and he would look at it, or thereabouts." Then he said: "This is what I saw the Messenger of Allah ﷺ doing." (Using translation from Nasāʾī 1160)   

أَنَّهُ رَأَى رَجُلًا يُحَرِّكُ الْحَصَا بِيَدِهِ وَهُوَ فِي الصَّلَاةِ فَلَمَّا انْصَرَفَ قَالَ لَهُ عَبْدُ اللهِ لَا تُحَرِّكِ الْحَصَا وَأَنْتَ فِي الصَّلَاةِ؛ فَإِنَّ ذَلِكَ مِنَ الشَّيْطَانِ وَلَكِنِ اصْنَعْ كَمَا كَانَ رَسُولُ اللهِ ﷺ يَصْنَعُ قَالَ وَكَيْفَ؟ قَالَ فَوَضَعَ يَدَهُ الْيُمْنَى عَلَى فَخِذِهِ وَأَشَارَ بِأُصْبُعِهِ الَّتِي تَلِي الْإِبْهَامَ فِي الْقِبْلَةِ وَرَمَى بِبَصَرِهِ إِلَيْهَا أَوْ نَحْوَهَا ثُمَّ قَالَ هَكَذَا رَأَيْتُ رَسُولَ اللهِ ﷺ يَصْنَعُ