Surah Az Zumar Tafseer

وَإِذَا ذُكِرَ اللَّهُ وَحْدَهُ

And when Allah Alone is mentioned,

means, when it is said there is no (true) God except Allah Alone,

اشْمَأَزَّتْ قُلُوبُ الَّذِينَ لَا يُوْمِنُونَ بِالاْخِرَةِ

the hearts of those who believe not in the Hereafter are filled with disgust.

Mujahid said,

"Their hearts are filled with disgust means they recoil in horror."

This is like the Ayah:

إِنَّهُمْ كَانُواْ إِذَا قِيلَ لَهُمْ لَا إِلَـهَ إِلاَّ اللَّهُ يَسْتَكْبِرُونَ

Truly, when it was said to them:"La ilaha illa Allah," they puffed themselves up with pride. (37:35)

which means, they were too proud to follow it. Their hearts could not accept anything good, and whoever cannot accept good will accept evil.

Allah says:

وَإِذَا ذُكِرَ الَّذِينَ مِن دُونِهِ

and when those besides Him are mentioned,

meaning, the idols and false gods --

this was the view of Mujahid --

إِذَا هُمْ يَسْتَبْشِرُونَ

behold, they rejoice!

means, they feel happy