Riyad as-Salihin

Riyad as-Salihin 822

Manners of Lying down on one's back and placing one leg upon the Other
The Book of the Etiquette of Sleeping, Lying and Sitting etc Search within the hadiths
Riyad as-Salihin 822
Arabic hadith text
وعن قيلة بنت مخرمة رضى الله عنها قالت‏:‏ رأيت النبي صلى الله عليه وسلم وهو قاعد القرفصاء، فلما رأيت رسول الله صلى الله عليه وسلم المتخشع في الجلسة أرعدت من الفرق‏.‏ ((رواه أبو داود والترمذي))‏.‏
Translation
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].