(Yoonus) 10 : 19
وَمَا كَانَ النَّاسُ إِلَّا أُمَّةً وَاحِدَةً فَاخْتَلَفُوا ۚ وَلَوْلَا كَلِمَةٌ سَبَقَتْ مِنْ رَبِّكَ لَقُضِيَ بَيْنَهُمْ فِيمَا فِيهِ يَخْتَلِفُونَ

And mankind was not except one community, then they differed; and if not a word from Lord had preceded, it would have been judged between them concerning what they have been differing in It.

Since Adhikr—Speech of Lord Allah—is revealed to form the real belief with the Lord. People of all periods differed in the Book, differentiated into groups and became Mushriks (those who associate others in the dominion of Allah). “And if not a word from Lord had preceded” mentioned in this verse is about the Day of Judgment. On that Day, the Standard of the Judgment will be Adhikr—the Truth. The believer will testify Adhikr, and judge his individual, family, and social life with It in this world itself, whereas the disbelievers who didn’t testify the Book or judge with It are postponing their judgment into the Hereafter as explained in verse 2: 113. If the Three-Time-Knower Lord hadn’t determined a fixed Day of Judgment as explained in verse 6: 2, He would have Judged among mankind who differed in the Book from this world itself. It is told in verse 40: 78: “By rejecting Adhikr—the Truth, the falsehood following hypocrites, and Mushriks will be the losers on the Day of Judgment”. See explanation 7: 8-9 and 10: 11.