Surah Taha 20:49

قَالَ فَمَن رَّبُّكُمَا يَـٰمُوسَىٰ

[Pharaoh] said, "So who is the Lord of you two, O Moses?"

Translation: Saheeh International

Tafsir

He said ‘So who is your Lord O Moses?’ — he Pharaoh restricted this question to him Moses because between him and Aaron he is the principal bearer of God’s Message and also because of his Pharaoh’s having pampered him while he was being reared as a child.

Excerpt from Tafsir al-Jalalayn, commentary on 20:49, via Quran.com. The reader has the full commentary and 9 more tafsirs.