Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
tirmidhi:420Bishr b. Muʿādh al-ʿAqadī > ʿAbd al-Wāḥid b. Ziyād > al-Aʿmash > Abū Ṣāliḥ > Abū Hurayrah

Messenger of Allah (S) said: "When one of you prays the two Rak'ah of Fajr then let him lay down on his right (side)."  

الترمذي:٤٢٠حَدَّثَنَا بِشْرُ بْنُ مُعَاذٍ الْعَقَدِيُّ حَدَّثَنَا عَبْدُ الْوَاحِدِ بْنُ زِيَادٍ حَدَّثَنَا الأَعْمَشُ عَنْ أَبِي صَالِحٍ عَنْ أَبِي هُرَيْرَةَ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا صَلَّى أَحَدُكُمْ رَكْعَتَىِ الْفَجْرِ فَلْيَضْطَجِعْ عَلَى يَمِينِهِ قَالَ وَفِي الْبَابِ عَنْ عَائِشَةَ  

قَالَ أَبُو عِيسَى حَدِيثُ أَبِي هُرَيْرَةَ حَدِيثٌ حَسَنٌ صَحِيحٌ غَرِيبٌ مِنْ هَذَا الْوَجْهِ وَقَدْ رُوِيَ عَنْ عَائِشَةَ أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا صَلَّى رَكْعَتَىِ الْفَجْرِ فِي بَيْتِهِ اضْطَجَعَ عَلَى يَمِينِهِ وَقَدْ رَأَى بَعْضُ أَهْلِ الْعِلْمِ أَنْ يُفْعَلَ هَذَا اسْتِحْبَابًا