Anas b. Malik reported that a person said: Allah's Messenger, how the non-believers would be made to assemble on the Day of Resurrection (by crawling) on their faces? Thereupon he said: Is He Who is powerfnl to make them walk on their feet is not powerful enough to make them (crawl) upon their faces on the Day of Resurrection? Qatada said: Of conrse, it is so. (He adjured): By the might of our Lord.