What is the 'awrah of a woman in prayer, what is the authentic evidence for that, and what is the opinion of Sheikh Ibn 'Uthaymeen, may Allah have mercy on him, concerning it?

Previously, the preponderant opinion regarding the 'awrah of a free woman in prayer, if she is not in the presence of men, has been clarified. Sheikh Ibn 'Uthaymeen holds that there is no clear evidence indicating the obligation for a woman to cover her face, hands, and feet.