Shaytan (Satan), who gave up the hope of divine mercy, and completely became alone as a result of assuming self-importance when he was commanded to prostrate for Hazrat Adam (peace be upon him), started to worry about his life. Then he begged Allah as follows: "Give me respite till the day they are raised up."  (Qur’an, al-A'raf, 7/14). What is meant by “till the day they are raised up” is the second blowing of the Sur (the trumpet of the day of Judgement)by the angel Israfel. (Qur’an, Az-Zumar, 39/68) (Qur’an, Al-Mutaffifin, 83/6).
As he knew that after resurrection there will no more be resurrecting, he was thinking that by asking for a respite he would be saved from death. His begging for immortality was answered as "Be you among those who have respite." (Qur’an, Al-Araf, 7/15) with the condition “Till the Day of the Time Appointed." (Qur’an, Al-Hijr, 15/38). What is meant by “Till the Day of the Time Appointed.", is the first blowing of the Sur (Qur’an, An-Naml, 27/87).
With this, he (Shaytan) preferred a life full of abasement and insult to death. And it became the real descent for him.
As it can be understood from the explanations above, as a matter of fact Shaytan did not deny Allah and resurrection after death. He also knew that Hazrat Adam (peace be upon him) will have generations on the earth, that they will live there for a while, that they will die
and that one day they will be resurrected. So then, his blasphemy was not because he denied Allah and lfe after death, but because he did not perform the given command and objected to it. (Yazır, Elmalılı,III, 2135).