(… إِنَّ الَّذِينَ كَفَرُوا ) (Indeed, those who disbelieve …): Those who conceal the existence of Allah (swt). According to the linguistic definition and the Shar’i terminology of the Arabic word of (disbeliever): He is the person who has concealed the existence of Allah (swt), Who is the creator of humans and the universe.
(… إِنَّ الَّذِينَ كَفَرُوا وَصَدُّوا عَن سَبِيلِ اللَّهِ ) (Indeed, those who disbelieve and avert [people] from the way of Allah …): They falled in two big sins:
First: They concealed the fact of existence of Allah (swt).
Second: They misled others because they averted the path of Allah (swt).
( قَدْ ضَلُّوا ضَلَالًا بَعِيدًا … ) (have certainly gone far astray …): Misguidance reaches children, grandchildren, and future generations, so they have gone far astray, for they have not just disbelieved and concealed the existence of Allah (swt), but also misled others and prevented people from following the path of Allah (swt).