Allah then says:

﴿يأَيُّهَا الَّذِينَ ءَامَنُواْ إِن تَنصُرُواْ اللَّهَ يَنصُرْكُمْ وَيُثَبِّتْ أَقْدَامَكُمْ ﴾

(O you who believe! If you support (the cause of) Allah, He will support you and make your foothold firm.) This is similar to His saying,

﴿وَلَيَنصُرَنَّ اللَّهُ مَن يَنصُرُهُ﴾

(Indeed, Allah will surely support those who support Him (His cause).) (22:40) That is because the reward is comparable to the type of deed that is performed. Thus, Allah says here,

﴿وَيُثَبِّتْ أَقْدَامَكُمْ﴾

(and make your foothold firm.) Allah then says,

﴿وَالَّذِينَ كَفَرُواْ فَتَعْساً لَّهُمْ﴾

(But as for those who disbelieve -- misery awaits them) This misery is the opposite of making firm the footholds of the believers who support the cause of Allah and His Messenger . It has been confirmed in a Hadith that Allah's Messenger said,

«تَعِسَ عَبْدُالدِّينَارِ، تَعِسَ عَبْدُالدِّرْهَمِ، تَعِسَ عَبْدُالْقَطِيفَةِ، تَعِسَ وَانْتَكَسَ وَإِذَا شِيكَ فَلَا انْتَقَش»

(Misery awaits the servant of the Dinar; misery awaits the servant of the Dirham; misery awaits the servant of velvet. Misery awaits him, and degeneracy; and if he is pricked by a thorn, may he not find anyone to pull it for him.) This means may Allah not cure him. Then Allah says,

﴿وَأَضَلَّ أَعْمَـلَهُمْ﴾

(and (Allah) will make their deeds vain.) meaning, He will nullify them and make them fruitless. Thus, Allah says,

﴿ذَلِكَ بِأَنَّهُمْ كَرِهُواْ مَآ أَنزَلَ اللَّهُ﴾

(That is because they hate that which Allah has sent down;) which means that they did not want or like what Allah revealed.

﴿فَأَحْبَطَ أَعْمَـلَهُمْ﴾

(so He made their deeds fruitless.)

﴿أَفَلَمْ يَسِيرُواْ فِى الاٌّرْضِ فَيَنظُرُواْ كَيْفَ كَانَ عَـقِبَةُ الَّذِينَ مِن قَبْلِهِمْ دَمَّرَ اللَّهُ عَلَيْهِمْ وَلِلْكَـفِرِينَ أَمْثَـلُهَا - ذَلِكَ بِأَنَّ اللَّهَ مَوْلَى الَّذِينَ ءَامَنُواْ وَأَنَّ الْكَـفِرِينَ لاَ مَوْلَى لَهُمْ - إِنَّ اللَّهَ يُدْخِلُ الَّذِينَ ءَامَنُواْ وَعَمِلُواْ الصَّـلِحَـتِ جَنَّـتٍ تَجْرِى مِن تَحْتِهَا الاٌّنْهَـرُ وَالَّذِينَ كَفَرُواْ يَتَمَتَّعُونَ وَيَأْكُلُونَ كَمَا تَأْكُلُ الاٌّنْعَـمُ وَالنَّارُ مَثْوًى لَّهُمْ - وَكَأَيِّن مِّن قَرْيَةٍ هِىَ أَشَدُّ قُوَّةً مِّن قَرْيَتِكَ الَّتِى أَخْرَجَتْكَ أَهْلَكْنَـهُمْ فَلاَ نَـصِرَ لَهُمْ ﴾

(10. Have they not traveled through the earth and seen what happened in the end to those before them Allah destroyed them completely, and a similar (awaits) the disbelievers.) (11. That is because Allah is the Protector of those who believe, whereas the disbelievers have no protector.) (12. Certainly Allah will admit those who believe and do righteous good deeds, into Gardens under which rivers flow (Paradise); while those who disbelieve enjoy their life and eat as cattle eat; but the Fire will be their abode.) (13. And how many a town mightier than your town that has driven you out We have destroyed, with none to help them!)