(Maryam) 19 : 64
وَمَا نَتَنَزَّلُ إِلَّا بِأَمْرِ رَبِّكَ ۖ لَهُ مَا بَيْنَ أَيْدِينَا وَمَا خَلْفَنَا وَمَا بَيْنَ ذَٰلِكَ ۚ وَمَا كَانَ رَبُّكَ نَسِيًّا
“And We don’t descend except with the Command of your Lord; to Him belongs what is before us and what is behind us and what is in between, and your Lord never forgets anything”.
When Meccan pagans enquired Messenger about the men of the cave, he replied to them that he will tell about it the next day without saying: “If Lord intends”. But he didn’t get any verses regarding that in the next 15 days. And on the 16th day, Angel Jibreel came with verses 18: 23-24. And when Messenger enquired about the delay of Jibreel’s coming, this verse was revealed. The Three-Time-Knower Lord encompasses whatever things in the universe. He neither sleeps nor does slumber seize Him as explained in verse 2: 255. See explanation 17: 17; 18: 23-24 and 80.