Surah Al-Ma'idah 5:115

قَالَ ٱللَّهُ إِنِّى مُنَزِّلُهَا عَلَيْكُمْ ۖ فَمَن يَكْفُرْ بَعْدُ مِنكُمْ فَإِنِّىٓ أُعَذِّبُهُۥ عَذَابًا لَّآ أُعَذِّبُهُۥٓ أَحَدًا مِّنَ ٱلْعَـٰلَمِينَ

Allāh said, "Indeed, I will send it down to you, but whoever disbelieves afterwards from among you - then indeed will I punish him with a punishment by which I have not punished anyone among the worlds."

Translation: Saheeh International

Tafsir

God said granting his supplication ‘Verily I shall send it down read munziluhā or munazziluhā to you; but whoever of you disbelieves afterward after it has been sent down I shall surely chastise him with a chastisement wherewith I chastise no other being from among all the worlds’ and so the angels descended with it …

Excerpt from Tafsir al-Jalalayn, commentary on 5:115, via Quran.com. The reader has the full commentary and 9 more tafsirs.