Muwatta Malik, Book 3, Hadith 198 (In-Book) ⓘ

Yahya related to me from Malik from Muslim ibn Abi Maryam that AIi ibn Abd ar-Rahman al-Muawi said, "Abdullah ibn Umar saw me playing with some small pebbles in the prayer. When I finished he forbade me, saying, 'Do as the Messenger of Allah, may Allah bless him and grant him peace, did.' I said, 'What did the Messenger of Allah, may Allah bless him and grant him peace, do?' He said, 'When he sat in the prayer, he placed his right hand on his right thigh and he closed his fist and pointed his index finger, and he placed his left hand on his left thigh. That is what he used to do.' "

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ مُسْلِمِ بْنِ أَبِي مَرْيَمَ، عَنْ عَلِيِّ بْنِ عَبْدِ الرَّحْمَنِ الْمُعَاوِيِّ، أَنَّهُ قَالَ رَآنِي عَبْدُ اللَّهِ بْنُ عُمَرَ وَأَنَا أَعْبَثُ بِالْحَصْبَاءِ فِي الصَّلاَةِ فَلَمَّا انْصَرَفْتُ نَهَانِي وَقَالَ اصْنَعْ كَمَا كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَصْنَعُ ‏.‏ فَقُلْتُ وَكَيْفَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَصْنَعُ قَالَ كَانَ إِذَا جَلَسَ فِي الصَّلاَةِ وَضَعَ كَفَّهُ الْيُمْنَى عَلَى فَخِذِهِ الْيُمْنَى وَقَبَضَ أَصَابِعَهُ كُلَّهَا وَأَشَارَ بِأَصْبُعِهِ الَّتِي تَلِي الإِبْهَامَ وَوَضَعَ كَفَّهُ الْيُسْرَى عَلَى فَخِذِهِ الْيُسْرَى وَقَالَ هَكَذَا كَانَ يَفْعَلُ ‏.‏