AbuUthman an-Nahdi said: When Ibn Mas'ud prayed he placed his left hand on the right. The Prophet ﷺ saw him and placed his right hand on his left one.
أَنَّهُ كَانَ يُصَلِّي فَوَضَعَ يَدَهُ الْيُسْرَى عَلَى الْيُمْنَى فَرَآهُ النَّبِيُّ ﷺ فَوَضَعَ يَدَهُ الْيُمْنَى عَلَى الْيُسْرَى