Al-Kahf · Ayah 70
قَالَ فَإِنِ ٱتَّبَعْتَنِى فَلَا تَسْـَٔلْنِى عَن شَىْءٍ حَتَّىٰٓ أُحْدِثَ لَكَ مِنْهُ ذِكْرًا
He said, "Then if you follow me, do not ask me about anything until I make to you about it mention [i.e., explanation]."
Quran 18:70 (Al-Kahf) · Saheeh International, Noor International Center (QuranEnc v1.1.2)