The word(s) "prone" appears 3 time(s) in 3 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) "Nor do I absolve my own self (of blame): the (human) soul is certainly prone to evil, unless my Lord do bestow His Mercy: but surely my Lord is Oft-forgiving, Most Merciful."

(2) It is he whom Allah guides, that is on true Guidance; but he whom He leaves astray - for such wilt thou find no protector besides Him. On the Day of Judgment We shall gather, them together, prone on their faces, blind, dumb, and deaf: their abode will be Hell: every time it shows abatement, We shall increase from them the fierceness of the Fire.

(3) Those who will be gathered to Hell (prone) on their faces,- they will be in an evil plight, and, as to Path, most astray.