Surah Al-Baqarah — Ayah 213 (2:213)
كَانَ ٱلنَّاسُ أُمَّةٗ وَٰحِدَةٗ فَبَعَثَ ٱللَّهُ ٱلنَّبِيِّـۧنَ مُبَشِّرِينَ وَمُنذِرِينَ وَأَنزَلَ مَعَهُمُ ٱلۡكِتَٰبَ بِٱلۡحَقِّ لِيَحۡكُمَ بَيۡنَ ٱلنَّاسِ فِيمَا ٱخۡتَلَفُواْ فِيهِۚ وَمَا ٱخۡتَلَفَ فِيهِ إِلَّا ٱلَّذِينَ أُوتُوهُ مِنۢ بَعۡدِ مَا جَآءَتۡهُمُ ٱلۡبَيِّنَٰتُ بَغۡيَۢا بَيۡنَهُمۡۖ فَهَدَى ٱللَّهُ ٱلَّذِينَ ءَامَنُواْ لِمَا ٱخۡتَلَفُواْ فِيهِ مِنَ ٱلۡحَقِّ بِإِذۡنِهِۦۗ وَٱللَّهُ يَهۡدِي مَن يَشَآءُ إِلَىٰ صِرَٰطٖ مُّسۡتَقِيمٍ ٢١٣
English translation (Saheeh International)
Mankind was [of] one religion [before their deviation]; then Allāh sent the prophets as bringers of good tidings and warners and sent down with them the Scripture in truth to judge between the people concerning that in which they differed. And none differed over it [i.e., the Scripture] except those who were given it - after the clear proofs came to them - out of jealous animosity among themselves. And Allāh guided those who believed to the truth concerning that over which they had differed, by His permission. And Allāh guides whom He wills to a straight path.
Brief commentary
People were one community. All of them were in agreement and guided following the way of their father Adam, until the Satan misguided them. They were then split into believers and disbelievers. For this reason, God sent messengers bringing good news of the mercy of God for those who had faith in Him and followed Him and warning the disbelievers of the severe punishment of God. Together with the messengers, God also sent books containing the undoubtable truth so that they could judge between people with respect to their disagreements. It was only those who were given the Torah that differed with regards to the matter of Muhammad (s) and his message despite its being clear. They did this out of injustice and jealousy. God then enabled the believers to recognise guidance from misguidance by His permission and will. God guides whoever He wishes to a perfectly straight path which is the path of faith.