Surah Al-Kahf 18:76

قَالَ إِن سَأَلْتُكَ عَن شَىْءٍۭ بَعْدَهَا فَلَا تُصَـٰحِبْنِى ۖ قَدْ بَلَغْتَ مِن لَّدُنِّى عُذْرًا

[Moses] said, "If I should ask you about anything after this, then do not keep me as a companion. You have obtained from me an excuse."

Translation: Saheeh International

Tafsir

And for this reason he said ‘If I ask you about anything after this after this instance then do not keep me in your company do not allow me to follow you for truly you will have found from me read ladunnī or ladunī on my part sufficient enough excuse’ for you to part company with me.

Excerpt from Tafsir al-Jalalayn, commentary on 18:76, via Quran.com. The reader has the full commentary and 9 more tafsirs.