رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 822
The Book of the Etiquette of Sleeping, Lying and Sitting etc
Manners of Lying down on one's back and placing one leg upon the Other
وَعَنْ قيلة بنت مخرمة رضى اللَّه عَنْهَا قَالَتْ: رَأَيْتُ النَّبِيَّ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ وَهُوَ قَاعِدٌ الْقُرْفُصَاءَ، فَلَمَّا رَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ الْمُتَخَشِّعَ فِي الْجِلْسَةِ أُرْعِدْتُ مِنَ الْفَرَقِ. ((رَوَاهُ أَبُو دَاوُد وَالتِّرْمِذِيّ)).
Qailah bint Makhramah (May Allah be pleased with her) reported: I saw the Prophet (ﷺ) seated with his arms enfolding his legs; and when I saw him in such a state of humble guise I trembled with fear due to the awe (he showed in that posture). [Abu Dawud and At-Tirmidhi].
Riyad as-Salihin, 822