Al-Kahf 91

كَذَٰلِكَ وَقَدْ أَحَطْنَا بِمَا لَدَيْهِ خُبْرًا ﴿٩١﴾

Kathalika waqad ahatna bima ladayhi khubran

So (it was)! And We knew all about him (Dhul-Qarnain). The Noble Quran