Surah Al-Hadid 57:3

هُوَ ٱلْأَوَّلُ وَٱلْـَٔاخِرُ وَٱلظَّـٰهِرُ وَٱلْبَاطِنُ ۖ وَهُوَ بِكُلِّ شَىْءٍ عَلِيمٌ

He is the First and the Last, the Ascendant and the Intimate, and He is, of all things, Knowing.

Translation: Saheeh International

Tafsir

He is the First preceding everything but without His having any beginning and the Last succeeding everything but without His having any end and the Manifest through the proofs for Him and the Hidden from the perception of the senses and He has knowledge of all things.

Excerpt from Tafsir al-Jalalayn, commentary on 57:3, via Quran.com. The reader has the full commentary and 9 more tafsirs.