(Ar-Ra'd) 13 : 40
وَإِنْ مَا نُرِيَنَّكَ بَعْضَ الَّذِي نَعِدُهُمْ أَوْ نَتَوَفَّيَنَّكَ فَإِنَّمَا عَلَيْكَ الْبَلَاغُ وَعَلَيْنَا الْحِسَابُ
And indeed, whether We show you part of what We Promise them or call you back, so, indeed your duty is conveying the Message, and upon Us is the Reckoning.
During Messenger's time, the Book was not codified. But today, Adhikr is codified as the Splendid Book. The believer will propagate It to whole mankind for utilizing It as the Balance and Trust to keep the universe in its equilibrium. Only with Adhikr-the Food, Cloth, and Sight of human soul-one can understand the Lord of the universe as well as form the harmony of mankind as explained in verses 2: 11-12. See explanation 5: 67; 9: 71-72 and 10: 47-48.