[Machine] That the messenger of Allah, may peace and blessings be upon him, sometimes used to place his hand on his beard during prayer without any purpose, and it was narrated from another weak source that it is from the hadith of Abu Dhar. And it is mentioned from Ibrahim al-Nakha'i that he said it was said that touching the beard in prayer is either one act or it is preferred to leave it, and this is similar to what is narrated in touching stones, one act. Abu Ahmad, may Allah have mercy on him, said that most of what Isa al-Qaddah narrates is not followed upon.  

أَنَّ رَسُولَ اللهِ ﷺ كَانَ رُبَّمَا يَضَعُ يَدَهُ عَلَى لِحْيَتِهِ فِي الصَّلَاةِ مِنْ غَيْرِ عَبَثٍ وَرُوِيَ مِنْ وَجْهٍ آخَرَ ضَعِيفٍ وَهُوَ مِنْ حَدِيثِ أَبِي ذَرٍّ وَيُذْكَرُ عَنْ إِبْرَاهِيمَ النَّخَعِيِّ أَنَّهُ قَالَ كَانَ يُقَالُ مَسُّ اللِّحْيَةِ فِي الصَّلَاةِ وَاحِدَةً أَوْ دَعْ وَهَذَا نَظِيرُ مَا يُرْوَى فِي مَسِّ الْحَصَى وَاحِدَةً قَالَ أَبُو أَحْمَدَ رَحِمَهُ اللهُ عَامَّةُ مَا يَرْوِيهِ عِيسَى الْقَدَّاحُ هَذَا لَا يُتَابَعُ عَلَيْهِ