Surah Adh-Dhariyat 51:38

وَفِى مُوسَىٰٓ إِذْ أَرْسَلْنَـٰهُ إِلَىٰ فِرْعَوْنَ بِسُلْطَـٰنٍ مُّبِينٍ

And in Moses [was a sign], when We sent him to Pharaoh with clear authority.

Translation: Saheeh International

Tafsir

And a sign too in Moses wa-fī Mūsā is a supplement to fīhā ‘therein’ that is to say We also left a sign in the story of Moses when We sent him to Pharaoh vested with a clear warrant with a manifest proof;

Excerpt from Tafsir al-Jalalayn, commentary on 51:38, via Quran.com. The reader has the full commentary and 9 more tafsirs.