Surah Al-Kahf 18:70

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]."

Translation: Saheeh International

Tafsir

He said ‘If you follow me then do not question me lā tas’alnī a variant reading has lā tas’alannī concerning anything that you might find objectionable in what I do according to your limited knowledge and be patient until I myself make mention of it to you’ in other words until I mention it to you with an explication …

Excerpt from Tafsir al-Jalalayn, commentary on 18:70, via Quran.com. The reader has the full commentary and 9 more tafsirs.