At the end of this subject the Qur'an says:
إِنَّ هَـٰذَا لَهُوَ حَقُّ الْيَقِينِ (Indeed this is certainty in its true sense...Al-Waqi'ah 56:95 ⧉). None of the reward or punishment mentioned in the preceding verses is refutable because they are a dead certainty that has no room for any doubt or suspicion.