"How they will walk on their faces on Judgment Day?"

وَنَحۡشُرُهُمۡ يَوۡمَ ٱلۡقِيَـٰمَةِ عَلَىٰ وُجُوهِهِمۡ عُمۡيً۬ا وَبُكۡمً۬ا وَصُمًّ۬ا‌ۖ مَّأۡوَٮٰهُمۡ جَهَنَّمُ‌ۖ ڪُلَّمَا خَبَتۡ زِدۡنَـٰهُمۡ سَعِيرً۬ا
"We shall gather them together on the Day of Resurrection on their faces, blind, dumb and deaf, their abode will be Hell; whenever it abates, We shall increase for them the fierceness of the Fire"
(Qur'an 17:97)

Anas bin Malik reported that a person said: O Allah's Messenger! How the non-believer would be made to assemble on the Day of Resurrection (by crawling) on his face?
Thereupon he s.a.w.s. said: "Will not the One who made him walk on his feet be able to make him walk (crawl) upon his face on the Day of Resurrection?"
(Qatada, a subnarrator said: Of course, by the Power of Our Lord!)

[Sahih Bukhari]