When Allah (swt) speaks about the Paradise, the believers, the doers of good and the pious, He (swt) also speaks about the opposite:

(… وَالَّذِينَ كَفَرُوا) (But those who disbelieved …): The Arabic word of (disbelieve) means to cover and conceal. Therefore, the disbelievers are those who conceal the existence of Allah (swt).

(… وَكَذَّبُوا بِآيَاتِنَا أُولَٰئِكَ أَصْحَابُ الْجَحِيمِ) (and denied Our signs – they are the companions of Hellfire …): Here, they are described as being companions of Hellfire because the companion is the one who chooses his companion, so they have chosen the Hellfire as a companion.