Surah Al-Ikhlas 112:1
قُلْ هُوَ ٱللَّهُ أَحَدٌ
Say, "He is Allāh, [who is] One,
Translation: Saheeh International
Tafsir
Say ‘He is God One Allāhu is the predicate of huwa ‘He is’ and ahadun is its substitution or a second predicate.
Excerpt from Tafsir al-Jalalayn, commentary on 112:1, via Quran.com. The reader has the full commentary and 9 more tafsirs.