Manners of Lying down on one’s back and placing one leg upon the Other

Imam Al-Nawawi’s Riyad-us-Saliheen
Chapter 128
Manners of Lying down on one’s back and placing one leg upon the Other

820. `Abdullah bin Zaid (May Allah be pleased with them) reported: I saw Messenger of Allah (sallallaahu ’alayhi wa sallam) lying down on his back in the mosque, placing one leg on the other.
[Al-Bukhari and Muslim].

821. Jabir bin Samurah (May Allah be pleased with him) reported: After the Fajr (dawn) prayer the Prophet (sallallaahu ’alayhi wa sallam) used to sit crossed legged in the same place in which he had prayed till the sun shone brightly.
[Abu Dawud].

822. Ibn `Umar (May Allah be pleased with them) reported: I saw Messenger of Allah (sallallaahu ’alayhi wa sallam) sitting in the compound of the Holy Ka`bah, with the thighs against the stomach and arms around his legs.
[Al-Bukhari].

823. Qailah bint Makhramah (May Allah be pleased with her) reported: I saw the Prophet (sallallaahu ’alayhi wa sallam) 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).
[At-Tirmidhi].

824. Ash-Sharid bin Suwaid (May Allah be pleased with him) reported: Messenger of Allah (sallallaahu ’alayhi wa sallam) passed by me when I was sitting with my left hand behind my back and leaning on my palm. On seeing me in this posture he said, “Do you sit like those upon whom the Wrath of Allah has descended?”
[Abu Dawud].