Despite their denial of the Resurrection, the Account and the punishment, the disbelievers will face them as reality and a truth. So, their denial will not negate their truth. Allah (swt) has warned them and affirmed this matter to them, but they did not believe in it. On the Resurrection Day, they will face what they used to deny and think it will not take place. On the Resurrection Day will be rush out of their graves, as Allah (swt) says:

يَوْمَ تَشَقَّقُ الْأَرْضُ عَنْهُمْ سِرَاعًا ۚ

(On the Day the earth breaks away from them [and they emerge] rapidly;) (Qaf: 44)

(… انطَلِقُوا) (Proceed …): This Arabic word means to run fast like when the horse is released from its bond.