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Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
tabarani:9344 – Isḥāq b. Ibrāhīm > ʿAbd al-Razzāq > al-Thawrī > al-Aʿmash > Abū al-Ḍuḥá > Masrūq

[Machine] Abdullah says, "Be calm and feel at ease in prayer."  

الطبراني:٩٣٤٤ – حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ عَنْ عَبْدِ الرَّزَّاقِ عَنِ الثَّوْرِيِّ عَنِ الْأَعْمَشِ عَنْ أَبِي الضُّحَى عَنْ مَسْرُوقٍ قَالَ قَالَ

عَبْدُ اللهِ «قَارُّوا فِي الصَّلَاةِ» يَقُولُ اسْكُنُوا اطْمَئِنُّوا  

See similar narrations below:

Collected by Bayhaqī, Suyūṭī
bayhaqi:3523 – Abū ʿAbdullāh al-Ḥāfiẓ And ʾAbū Saʿīd b. Abū ʿAmr > Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Usayd b. ʿĀṣim > al-Ḥusayn b. Ḥafṣ > Sufyān > al-Aʿmash > Abū al-Ḍuḥá > Masrūq

[Machine] Abdullah bin Mas'ud said, "Recite properly during the prayer."  

البيهقي:٣٥٢٣ – أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ وَأَبُو سَعِيدِ بْنُ أَبِي عَمْرٍو قَالَا ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ ثنا أُسَيْدُ بْنُ عَاصِمٍ ثنا الْحُسَيْنُ بْنُ حَفْصٍ عَنْ سُفْيَانَ قَالَ حَدَّثَنِي الْأَعْمَشُ عَنْ أَبِي الضُّحَى عَنْ مَسْرُوقٍ قَالَ

قَالَ عَبْدُ اللهِ بْنُ مَسْعُودٍ قَارُّوا فِي الصَّلَاةِ  

suyuti:430-56b-2 – Masrūq > Qāl ʿAbdullāh Qārrwā al-Ṣalāh
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السيوطي:٤٣٠-٥٦b-٢ –

"عَنْ مَسْرُوق قَالَ: قَالَ عَبْدُ الله قَارّوا الصَّلَاةَ يَقُولُ: اسْكُنُوا اطْمَئنوا".  

[عب] عبد الرازق