ENOfficial
It was narrated from Malik bin Numair Al-Khuza’i that his father said: “I saw the Prophet (ﷺ) putting his right hand on his right thigh during prayer, and pointing with his finger.”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا وَكِيعٌ، عَنْ عِصَامِ بْنِ قُدَامَةَ، عَنْ مَالِكِ بْنِ نُمَيْرٍ الْخُزَاعِيِّ، عَنْ أَبِيهِ، قَالَ رَأَيْتُ النَّبِيَّ ـ صلى الله عليه وسلم ـ وَاضِعًا يَدَهُ الْيُمْنَى عَلَى فَخِذِهِ الْيُمْنَى فِي الصَّلاَةِ وَيُشِيرُ بَإِصْبَعِهِ .
sunnah.com