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ahmad:9368 – ʿAffān > ʿAbd al-Wāḥid b. Ziyād > Sulaymān al-Aʿmash > Abū Ṣāliḥ > Abū Hurayrah

[Machine] The Messenger of Allah ﷺ said, "When one of you prays the two units of prayer before Fajr, let him lie down on his right side."  

أحمد:٩٣٦٨ – حَدَّثَنَا عَفَّانُ حَدَّثَنَا عَبْدُ الْوَاحِدِ بْنُ زِيَادٍ حَدَّثَنَا سُلَيْمَانُ الْأَعْمَشُ عَنْ أَبِي صَالِحٍ عَنْ أَبِي هُرَيْرَةَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ إِذَا صَلَّى أَحَدُكُمُ الرَّكْعَتَيْنِ قَبْلَ صَلَاةِ الصُّبْحِ فَلْيَضْطَجِعْ عَلَى جَنْبِهِ الْأَيْمَنِ  

See similar narrations below:

Collected by Suyūṭī
suyuti:2065a –
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السيوطي:٢٠٦٥a –

"إِذا صَلّى أحدُكُمْ الرَّكْعَتَينِ: ركعَتى الفجْر قبَل صلاةِ الصُّبحِ فليضْطَجِعْ عَلَى جَنْبه الأيمنِ" .  

[د] أبو داود [ت] الترمذي حسن صحيح غريب، [حب] ابن حبّان [ق] البيهقى في السنن عن أبي هريرة