Surah Qaf 50:26

ٱلَّذِى جَعَلَ مَعَ ٱللَّهِ إِلَـٰهًا ءَاخَرَ فَأَلْقِيَاهُ فِى ٱلْعَذَابِ ٱلشَّدِيدِ

Who made [as equal] with Allāh another deity; then throw him into the severe punishment."

Translation: Saheeh International

Tafsir

who has set up alongside God another god! alladhī ja‘ala ma‘a’Llāhi ilāhan ākhara is the subject with an implicitly conditional import the predicate of which is the following. Cast him then into the severe chastisement’ the explanation of this dual form of the verb alqiyāhu ‘cast him’ is as above.

Excerpt from Tafsir al-Jalalayn, commentary on 50:26, via Quran.com. The reader has the full commentary and 9 more tafsirs.