Allah (swt) states the fate of those who disbelieved among the People of the Scripture and the polytheists, that they turned away from the Messenger of Allah (saw), accused him of falsehood, and changed what was revealed to them of the good tidings of the coming of the Messenger of Allah (saw), and that it is mentioned in their books. As well as, the polytheists, who had associated with Allah (swt) idols and statues and disbelieved, that is, they have hidden the truth that all the Messengers had brought forth, and that there is no God but Allah (swt), that there is no true worshiped except Allah (swt), that Allah (swt) is alone, that He (swt) has no partner and that He (swt) is the only One Who really deserves worshipping. These people [who disbelieved among the People of the Scripture] and those people [the polytheists] are in the fire of Hell; they will abide therein forever. This is their painful destiny they ended to as a result of their disbelief and denial.
(Those are the worst of creatures): That is, the evilest creatures, as there is an evil in regards of another evil, but what is less than that? It is the same as the word “better” in the noble hadith:
(A strong believer is better and dearer to Allah than a weak one, and both are good)