Surah Fatir 35:31

وَٱلَّذِىٓ أَوْحَيْنَآ إِلَيْكَ مِنَ ٱلْكِتَـٰبِ هُوَ ٱلْحَقُّ مُصَدِّقًا لِّمَا بَيْنَ يَدَيْهِ ۗ إِنَّ ٱللَّهَ بِعِبَادِهِۦ لَخَبِيرٌۢ بَصِيرٌ

And that which We have revealed to you, [O Muḥammad], of the Book is the truth, confirming what was before it. Indeed Allāh, of His servants, is Aware and Seeing.

Translation: Saheeh International

Tafsir

And that which We have revealed to you of the Book the Qur’ān is the truth confirming what was revealed before it in other words confirming the Books that came before it. Indeed with regard to His servants God is truly Aware and Seeing knowing both their inward and outward aspects.

Excerpt from Tafsir al-Jalalayn, commentary on 35:31, via Quran.com. The reader has the full commentary and 9 more tafsirs.