Muhammad ibn Ali ibn Mahbub from Ahmad from al-Barqi from al-Nawfali from al-Sakuni from Imam Ja’far عليه السلام, from his father عليه السلام, peace be upon them both: The Prophet صلى الله عليه وعلى آله وسلم, peace be upon him and his family, said: “Uncovering the navel, the thigh, and the knee in the mosque is from the ‘awrah (private parts to be covered).”