The Holy Quran 10:19 — Surah Yunus

Arabic text

وَمَا كَانَ ٱلنَّاسُ إِلَّآ أُمَّةً وَٰحِدَةً فَٱخْتَلَفُوا۟ ۚ وَلَوْلَا كَلِمَةٌ سَبَقَتْ مِن رَّبِّكَ لَقُضِىَ بَيْنَهُمْ فِيمَا فِيهِ يَخْتَلِفُونَ

Translation

Mankind was but a single nation (the people were Muslims during the time of Aadam عليه الصلاة والسلام and after the flood during the time of Nooh عليه الصلاة والسلام), afterwards they differed (when some of them resorted to kufr and Shirk). If it were not for a decision that issued forth from your Rabb (that they are to be punished at a later time or only in the Aakhirah), the matter would have been decided between them concerning that about which they differed. (If the time for their punishment had not been already set for a future date, the Kuffaar would have already learnt that they are wrong when Allaah's punishment destroys them and leaves the Mu'mineen unharmed.)

Tafsir (excerpt) — Tafsir Usmani

The demand for a sign of the truth: the idolaters might have said: “Perhaps Allah forbade it in your religion, but He has not forbidden it in ours.” To this the answer has been given that the religion of Allah has always been one. There is no difference in the true beliefs.

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