Surah An-Nahl 16:102

قُلْ نَزَّلَهُۥ رُوحُ ٱلْقُدُسِ مِن رَّبِّكَ بِٱلْحَقِّ لِيُثَبِّتَ ٱلَّذِينَ ءَامَنُوا۟ وَهُدًى وَبُشْرَىٰ لِلْمُسْلِمِينَ

Say, [O Muḥammad], "The Pure Spirit [i.e., Gabriel] has brought it down from your Lord in truth to make firm those who believe and as guidance and good tidings to the Muslims."

Translation: Saheeh International

Tafsir

Say to them ‘The Holy Spirit Gabriel has revealed it from your Lord with truth bi’l-haqq this is semantically connected to nazzala ‘he Gabriel has revealed it’ to confirm the faith of those who believe by their believing in it when it is revealed and as guidance and good tidings for those who have submitted to God’.

Excerpt from Tafsir al-Jalalayn, commentary on 16:102, via Quran.com. The reader has the full commentary and 9 more tafsirs.