رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 1110
The Book of Virtues
Desirability of Lying down on one's right side after the Sunnah of Fajr Prayer
عَنْ عَائِشَةَ رَضِيَ اللَّه عَنْهَا قَالَتْ: كَانَ النَّبِيُّ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ إِذَا صَلَّى رَكْعَتَيْ اَلْفَجْرِ، اِضْطَجَعَ عَلَى شِقِّهِ اَلْأَيْمَنِ. ((رَوَاهُ اَلْبُخَارِيُّ)).
'Aishah (May Allah be pleased with her) reported: When the Prophet (ﷺ) had performed two Rak'ah before the Fajr prayer, he would lie down on his right side. [Al-Bukhari].
Riyad as-Salihin, 1110