Surah Al-Kahf, Verse 70

قَالَ فَإِنِ ٱتَّبَعۡتَنِي فَلَا تَسۡـَٔلۡنِي عَن شَيۡءٍ حَتَّىٰٓ أُحۡدِثَ لَكَ مِنۡهُ ذِكۡرٗا٧٠

qāla fa-ini ittabaʿtanī falā tasalnī ʿan shayin ḥattā uḥ'ditha laka min'hu dhik'ran

He said, "Then if you follow me, do not ask me about anything until I make to you about it mention [i.e., explanation]."