Ash-Shama'il Al-Muhammadiyah: The Sitting Of Rasoolullah

'Abdu’llah ibn Hassan reported on the authority of his grandmothers:
Qaila bint Makhrama said that she saw Allah’s Messenger (Allah bless him and give him peace) in the mosque squatting on his heels. She said: "When I saw Allah’s Messenger (Allah bless him and give him peace) displaying humility in the mosque, I trembled with fright."
Reference : Ash-Shama'il Al-Muhammadiyah 126
In-book reference : Book 20, Hadith 1
'Abbad ibn Tamim reported:
His paternal uncle said that he saw the Prophet (Allah bless him and give him peace) lying on his back in the mosque, placing one of his legs over the other.
Reference : Ash-Shama'il Al-Muhammadiyah 127
In-book reference : Book 20, Hadith 2
Abu Sa'id al-Khudri said:
“When Allah’s Messenger (Allah bless him and give him peace) sat in the mosque, he pressed his legs against his stomach with his hands.”
Reference : Ash-Shama'il Al-Muhammadiyah 128
In-book reference : Book 20, Hadith 3