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bayhaqi:2327 – Abū ʿAlī al-Rūdhbārī > Abū Bakr b. Dāsah > Abū Dāwud > Muḥammad b. Bakkār b. al-Rayyān > Hushaym b. Bashīr > al-Ḥajjāj b. Abū Zaynab > Abū ʿUthmān al-Nahdī > Ibn Masʿūd

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. (Using translation from Abū Dāʾūd 755)   

البيهقي:٢٣٢٧ – أَخْبَرَنَا أَبُو عَلِيٍّ الرُّوذْبَارِيُّ أنبأ أَبُو بَكْرِ بْنُ دَاسَةَ ثنا أَبُو دَاوُدَ ثنا مُحَمَّدُ بْنُ بَكَّارِ بْنِ الرَّيَّانِ عَنْ هُشَيْمِ بْنِ بَشِيرٍ عَنِ الْحَجَّاجِ بْنِ أَبِي زَيْنَبَ عَنْ أَبِي عُثْمَانَ النَّهْدِيِّ عَنِ ابْنِ مَسْعُودٍ ؓ

أَنَّهُ كَانَ يُصَلِّي فَوَضَعَ يَدَهُ الْيُسْرَى عَلَى الْيُمْنَى فَرَآهُ النَّبِيُّ ﷺ فَوَضَعَ يَدَهُ الْيُمْنَى عَلَى الْيُسْرَى  

See similar narrations below:

Collected by Abū Dāwūd
abudawud:755 – Muḥammad b. Bakkār b. al-Rayyān > Hushaym b. Bashīr > al-Ḥajjāj b. Abū Zaynab > Abū ʿUthmān al-Nahdī > Ibn Masʿūd

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.  

أبو داود:٧٥٥ – حَدَّثَنَا مُحَمَّدُ بْنُ بَكَّارِ بْنِ الرَّيَّانِ عَنْ هُشَيْمِ بْنِ بَشِيرٍ عَنِ الْحَجَّاجِ بْنِ أَبِي زَيْنَبَ عَنْ أَبِي عُثْمَانَ النَّهْدِيِّ عَنِ ابْنِ مَسْعُودٍ

أَنَّهُ كَانَ يُصَلِّي فَوَضَعَ يَدَهُ الْيُسْرَى عَلَى الْيُمْنَى فَرَآهُ النَّبِيُّ ﷺ فَوَضَعَ يَدَهُ الْيُمْنَى عَلَى الْيُسْرَى