(They indeed are losers who deny their meeting with Allah) i.e. deny their resurrection after death; Allah says: leave them (until, when the Hour cometh on them suddenly, they cry: Alas for us) how great is our sadness, and how sorry we are, (that we neglected it!) that we neglected faith and repentance in our worldly life. (They bear upon their back their burdens) their sins. (Ah, evil is that which they bear) of sins!