The people were ordered to place the right hand on the left forearm in the prayer. Abu Hazim said, "I knew that the order was from the Prophet ﷺ ."
أَنْ يَضَعَ الرَّجُلُ الْيَدَ الْيُمْنَى عَلَى ذِرَاعِهِ الْيُسْرَى فِي الصَّلاَةِ قَالَ أَبُو حَازِمٍ لاَ أَعْلَمُهُ إِلاَّ يَنْمِي ذَلِكَ إِلَى النَّبِيِّ ﷺ قَالَ إِسْمَاعِيلُ يُنْمَى ذَلِكَ وَلَمْ يَقُلْ يَنْمِي
Yahya related to me from Malik from Abu Hazim ibn Dinar that Sahl ibn Sad said, "People used to be ordered to place their right hands on their left forearms in the prayer." Abu Hazim added, "I know for sure that Sahl traces that back to the Prophet ﷺ."
أَنَّهُ قَالَ كَانَ النَّاسُ يُؤْمَرُونَ أَنْ يَضَعَ الرَّجُلُ الْيَدَ الْيُمْنَى عَلَى ذِرَاعِهِ الْيُسْرَى فِي الصَّلاَةِ قَالَ أَبُو حَازِمٍ لاَ أَعْلَمُ إِلاَّ أَنَّهُ يَنْمِي ذَلِكَ
[Machine] "That they place their right hand over their left hand during prayer. Abu Hazim said, 'And I do not know except that it lengthens it.' Abu Abdul Rahman said, 'It lengthens it by raising it to the Prophet ﷺ ."
أَنْ يَضَعُوا الْيُمْنَى عَلَى الْيُسْرَى فِي الصَّلَاةِ قَالَ أَبُو حَازِمٍ وَلَا أَعْلَمُ إِلَّا يُنْمِي ذَلِكَ قَالَ أَبُو عَبْدِ الرَّحْمَنِ يُنْمِي يَرْفَعُهُ إِلَى النَّبِيِّ ﷺ
[Machine] That a man places his right hand on his left arm during prayer. Abu Hazim said, "And I know nothing except that he extends it or says a word similar to it."
أَنْ يَضَعَ الرَّجُلُ يَدَهُ الْيُمْنَى عَلَى ذِرَاعِهِ الْيُسْرَى فِي الصَّلَاةِ قَالَ أَبُو حَازِمٍ وَلَا أَعْلَمُ إِلَّا أَنَّهُ يُنْمِي ذَلِكَ أَوْ كَلِمَةً تُشْبِهُهَا