Surah Al-A'la 87:7

إِلَّا مَا شَآءَ ٱللَّهُ ۚ إِنَّهُۥ يَعْلَمُ ٱلْجَهْرَ وَمَا يَخْفَىٰ

Except what Allāh should will. Indeed, He knows what is declared and what is hidden.

Translation: Saheeh International

Tafsir

except what God may will that you forget by abrogating its recitation and its ruling — the Prophet s used to recite aloud while Gabriel recited fearing to forget and so it is as though it was said to him ‘Do not hasten in it; you will not forget and so do not weary yourself by reciting it aloud’; …

Excerpt from Tafsir al-Jalalayn, commentary on 87:7, via Quran.com. The reader has the full commentary and 9 more tafsirs.