Shaykh Uthaymīn (rahimahullaah) explained the outcome for those who reject the truth, based on the tafsir of the following verse:
بَلْ كَذَّبُوا بِالْحَقِّ لَمَّا جَاءَهُمْ فَهُمْ فِي أَمْرٍ مَرِيجٍ
Nay, but they have denied the truth (this Qurān) when it has come to them, so they are in a confused state (can not differentiate between right and wrong).
Sura Qāf: 5
“Likewise every person who rejects the truth the first time, then he should know that he will be trialed with doubts and uncertainty in accepting the truth in the future. Therefore it is obligatory upon us when we hear that this thing is the truth, that we say: “we hear and obey.”
Tafsīr Al-Hujurāt – Al-Hadīd 89-90