This is because those who disbelieve are following falsehood, while those who believe are following the truth from their Lord. God thus cites for the people their examples.
ذٰلِكَ بِأَنَّ الَّذينَ كَفَرُوا اتَّبَعُوا البٰطِلَ وَأَنَّ الَّذينَ ءامَنُوا اتَّبَعُوا الحَقَّ مِن رَبِّهِم كَذٰلِكَ يَضرِبُ اللَّهُ لِلنّاسِ أَمثٰلَهُم
zaalika bi annal lazeena kafarut taba’ul baatila wa annal lazeena aamanut taba’ul haqqa mir Rabbihim; kazaalika yadribul laahu linnaasi amsaalahum