Qur'an
Surah 2 2:257
ٱللَّهُ وَلِیُّ ٱلَّذِینَ ءَامَنُوا۟ یُخۡرِجُهُم مِّنَ ٱلظُّلُمَـٰتِ إِلَى ٱلنُّورِۖ وَٱلَّذِینَ كَفَرُوۤا۟ أَوۡلِیَاۤؤُهُمُ ٱلطَّـٰغُوتُ یُخۡرِجُونَهُم مِّنَ ٱلنُّورِ إِلَى ٱلظُّلُمَـٰتِۗ أُو۟لَـٰۤىِٕكَ أَصۡحَـٰبُ ٱلنَّارِۖ هُمۡ فِیهَا خَـٰلِدُونَ ۝٢٥٧
God is the ally of those who believe: He brings them out of the depths of darkness and into the light. As for the disbelievers, their allies are false gods who take them from the light into the depths of darkness, they are the inhabitants of the Fire, and there they will remain

Allah stated that whoever follows what pleases Him, He will guide him to the paths of peace, that is Islam, or Paradise. Verily, Allah delivers His believing servants from the darkness of disbelief, doubt and hesitation, to the light of the plain, clear, explained, easy and unequivocal truth. He also stated that Shaytan is the supporter of the disbelievers who beautifies the paths of ignorance and misguidance that they follow, thus causing them to deviate from the true path into disbelief and wickedness.
أُولَـئِكَ أَصْحَـبُ النَّارِ هُمْ فِيهَا خَـلِدُونَ
(Those are the dwellers of the Fire, and they will abide therein forever.)
This is why Allah mentioned the light in the singular while mentioned the darkness in the plural, because truth is one, while disbelief comes as several types, all of which are false. Similarly, Allah said,
وَأَنَّ هَـذَا صِرَطِي مُسْتَقِيمًا فَاتَّبِعُوهُ وَلاَ تَتَّبِعُواْ السُّبُلَ فَتَفَرَّقَ بِكُمْ عَن سَبِيلِهِ ذَلِكُمْ وَصَّـكُمْ بِهِ لَعَلَّكُمْ تَتَّقُونَ
(And verily, this is my straight path, so follow it, and follow not (other) paths, for they will separate you away from His path. This He has ordained for you that you may have Taqwa) 6:153,
وَجَعَلَ الظُّلُمَـتِ وَالنُّورَ
(And originated the darknesses and the light) 6:1, and,
ظِلَـلُهُ عَنِ الْيَمِينِ
(to the right and to the lefts) 16: 48
There are many other Ayat on the subject that mention the truth in the singular and falsehood in the plural, because of falsehood's many divisions and branches.

(Allah is the Protecting Friend of those who believe) He protects and gives victory to the believers, referring here to 'Abdullah Ibn Salam and his companions. (He bringeth them out of darkness into light) He gave them success and brought them out of disbelief into faith. (As for those who disbelieve) i.e. Ka'b Ibn al-Ashraf and his companions, (their patrons are false deities) the devil. (They bring them out of light into darkness) they invite them from faith to disbelief. (Such are rightful owners of the Fire) the dwellers of hell. (They will abide therein forever) never to die or leave it.

EN

God is the Protector helper of the believers; He brings them forth from the shadows of unbelief into the light of faith. And the disbelievers — their protectors are false deities that bring them forth from the light into the shadows the repetition of ‘bringing forth from’ here is either to be taken as a reflection of His previous words “He brings them forth from the shadows” or as a reference to all those Jews who believed in the Prophet before he was sent but then rejected him those are the inhabitants of the Fire therein they shall abide.

EN

Commentary
This verse also tells us that faith ('Iman ایمان ) is the greatest blessing
and disbelief (kufr کفر ) is the greatest misfortune, and that there is darkness in friendship with those who disbelieve (kuffar کُفار ).

EN

Unlike sincere devotees, there are some who never accept religion at the cost of the surrender of their being. They are never serious in matters of religion, and as a result believe that intercession by certain religious seers or the performance of certain rituals, or the observance of certain forms is enough to earn salvation in the Hereafter. Due to their insincerity about the Hereafter, they fail to understand that Doomsday is the Day of the manifestation of God’s power and majesty. Hoping that the performance of certain superficial rituals might earn them God Almighty’s pleasure is indeed an underestimation of God’s divinity. This only increases their sinfulness in the eyes of God. The truth comes to one in the form of arguments, and one who is not sincere summarily rejects them. This is one of Satan’s temptations. Guidance comes only to those who scrupulously resist Satan’s temptations and, recognizing the divine arguments, wholeheartedly concur in them.