Surat Al Baqarah (6-10)

﴿ إِنَّ الَّذِينَ كَفَرُوا سَوَاءٌ عَلَيْهِمْ أَأَنْذَرْتَهُمْ أَمْ لَمْ تُنْذِرْهُمْ لاَ يُؤْمِنُونَ ﴾ [البقرة:  6]  

6- Those who disbelieve in that which has sent down to you are not believers as long as they insist on their position. They do not lend an ear to the warnings they hear from you.

﴿ خَتَمَ اللَّهُ عَلَى قُلُوبِهِمْ وَعَلَى سَمْعِهِمْ وَعَلَى أَبْصَارِهِمْ غِشَاوَةٌ وَلَهُمْ عَذَابٌ عَظِيمٌ ﴾ [البقرة:  7]  

7- Allah has sealed their hearts, their hearing, and their eyes also were sealed as a result of their disbelief and their indifference. Consequently, theirs sins became ample until the centers of their understanding and sights were blocked, so there is no way for faith to enter or disbelief to get out. The retribution of their stubbornness and lack of response to the warner is a great torment.

﴿ وَمِنَ النَّاسِ مَنْ يَقُولُ آمَنَّا بِاللَّهِ وَبِالْيَوْمِ الآْخِرِ وَمَا هُمْ بِمُؤْمِنِينَ ﴾ [البقرة:  8]

8- There are some hypocrites who show faith and hide disbelief, and they do good publicly and conceal evil. They say: We believe in Allah and in the Day of Retribution but in fact, they are disbelievers.

﴿ يُخَادِعُونَ اللَّهَ وَالَّذِينَ آمَنُوا وَمَا يَخْدَعُونَ إِلاَّ أَنْفُسَهُمْ وَمَا يَشْعُرُونَ ﴾ [البقرة:  9]

9– They believe, by their ignorance, that they are deceiving Allah, and that method will benefit them before Allah. They think they are able to deceive Allah by this trick as they usually do with Muslims but their deeds will only harm them because Allah will pour wrath on them without their knowledge, so they will walk blindly in their way.

﴿ فِي قُلُوبِهِمْ مَرَضٌ فَزَادَهُمُ اللَّهُ مَرَضًا وَلَهُمْ عَذَابٌ أَلِيمٌ بِمَا كَانُوا يَكْذِبُونَ ﴾ [البقرة:  10]

10 - In their hearts is a disease that causes them to depart from the truth and insist on following falsehood. Therefore, Allah has increased their illness by making them turn completely away from the Straight Way and the disease kept on going along with their stubbornness. They had doubts and Allah increased their doubts as He has increased the faith of the believers (And those who have believed, He increased their faith) [Muhammad: 17].

So, the hypocrites deserved such a harsh punishment because of their lies and their stance against the truth. Lie is a type of hypocrisy and it corrupts the heart fast.