Allah's saying;

﴿قُل لِّلَّذِينَ ءَامَنُواْ يَغْفِرُواْ لِلَّذِينَ لاَ يَرْجُونَ أَيَّامَ اللَّهِ﴾

(Say to the believers to forgive those who hope not for the Days of Allah,) means, let the believers forgive the disbelievers and endure the harm that they direct against them. In the beginning of Islam, Muslims were ordered to observe patience in the face of the oppression of the idolators and the People of the Scriptures so that their hearts may incline towards Islam. However, when the disbelievers persisted in stubbornness, Allah legislated for the believers to fight in Jihad. Statements of this meaning were collected from `Abdullah bin `Abbas and Qatadah. Mujahid said about Allah's statement,

﴿لاَ يَرْجُونَ أَيَّامَ اللَّهِ﴾

(those who hope not for the Days of Allah,) "They do not appreciate Allah's favors.'' Allah said,

﴿لِيَجْزِىَ قَوْماً بِمَا كَانُواْ يَكْسِبُونَ﴾

(that He may recompense people, according to what they have earned.) meaning, if the believers forgive the disbelievers in this life, Allah will still punish the disbelievers for their evil in the Hereafter. Allah's statement next,

﴿مَنْ عَمِلَ صَـلِحاً فَلِنَفْسِهِ وَمَنْ أَسَآءَ فَعَلَيْهَا ثُمَّ إِلَى رَبِّكُمْ تُرْجَعُونَ ﴾

(Whosoever does a good deed, it is for himself, and whosoever does evil, it is against (himself). Then to your Lord you will be made to return.) meaning, you will all return to Allah on the Day of Resurrection, when you and your actions will be displayed before Him. Then, He will recompense you for your deeds, good for good and evil for evil.

﴿وَلَقَدْ ءَاتَيْنَا بَنِى إِسْرَءِيلَ الْكِتَـبَ وَالْحُكْمَ وَالنُّبُوَّةَ وَرَزَقْنَـهُمْ مِّنَ الطَّيِّبَـتِ وَفَضَّلْنَـهُمْ عَلَى الْعَـلَمينَ - وَءاتَيْنَـهُم بَيِّنَـتٍ مِّنَ الاٌّمْرِ فَمَا اخْتَلَفُواْ إِلاَّ مِن بَعْدِ مَا جَآءَهُمُ الْعِلْمُ بَغْياً بَيْنَهُمْ إِنَّ رَبَّكَ يَقْضِى بِيْنَهُمْ يَوْمَ الْقِيَـمَةِ فِيمَا كَانُواْ فِيهِ يَخْتَلِفُونَ - ثُمَّ جَعَلْنَـكَ عَلَى شَرِيعَةٍ مِّنَ الاٌّمْرِ فَاتَّبِعْهَا وَلاَ تَتَّبِعْ أَهْوَآءَ الَّذِينَ لاَ يَعْلَمُونَ ﴾

﴿إِنَّهُمْ لَن يُغْنُواْ عَنكَ مِنَ اللَّهِ شَيْئاً وَإِنَّ الظَّـلِمِينَ بَعْضُهُمْ أَوْلِيَآءُ بَعْضٍ وَاللَّهُ وَلِىُّ الْمُتَّقِينَ - هَـذَا بَصَـئِرُ لِلنَّاسِ وَهُدًى وَرَحْمَةً لِّقَوْمٍ يُوقِنُونَ ﴾

(16. And indeed We gave the Children of Israel the Scripture, and the understanding of the Scripture and its laws, and the prophethood; and provided them with good things, and preferred them above the nations.) (17. And gave them clear proofs in matters. And they differed not until after the knowledge came to them, through envy among themselves. Verily, your Lord will judge between them on the Day of Resurrection about that wherein they used to differ.) (18. Then We have put you on a (legal) way of commandment. So follow you that, and follow not the desires of those who know not.) (19. Verily, they can avail you nothing against Allah. Verily, the wrongdoers are protecting friends of one another, but Allah is the Protector of those who have Taqwa.) (20. This is a clear insight and evidence for mankind, and a guidance and a mercy for people who have faith with certainty.)