Why is the verb "perceive / یشعرون" negated in two different styles in Baqarah: 9 and 12, and what's the exact difference?

Question

The 9th and 12th verses of Baqarah read as follows: > يُخَادِعُونَ اللَّـهَ وَالَّذِينَ آمَنُوا وَمَا يَخْدَعُونَ إِلَّا أَنفُسَهُمْ وَمَا يَشْعُرُونَ> > They would trick God and believers, and only themselves they deceive> and they do not perceive [this].> > أَلَا إِنَّهُمْ هُمُ الْمُفْسِدُونَ وَلَـٰكِن لَّا يَشْعُرُونَ> > Truly, they are the workers of corruption, but they do not perceive> [this].From a native Arabian's viewpoint, how these two styles of negation (i.e. ما یشعرون and لا یشعرون) can possibly be different? I know there can be no big semantic difference, yet what about any fine one?

Answer 1

The first one is for a specific sin and the second one for another different sin. Repetition here reflects importance, certification of facts. They trick god but they don’t even feel any wrongness, they affect anything around and again they don’t feel any remorse. Also, god wants to describe this category of hypocrites to facilitate their recognition.