(Ambiya') 21 : 111
وَإِنْ أَدْرِي لَعَلَّهُ فِتْنَةٌ لَكُمْ وَمَتَاعٌ إِلَىٰ حِينٍ
“And I don’t know whether this is a trial for you and livelihood for a time”.
The Book was not codified during the revelation of this verse. But today, Adhikr which is the Best Interpretation of Lord’s Book is codified through the Three-Time-Knower mentioned in verse 25: 59. It explains everything and It is a Mercy, Guidance, and Herald for true Muslims as explained in verse 16: 89. See explanation 5: 48; 20: 15 and 21: 7.