Al-Muumin 40:28 وقال رجل مومن من ال فرعون يكتم ايمانه اتقتلون رجلا ان يقول ربي الله وقد جاءكم بالبينات من ربكم وان يك كاذبا فعليه كذبه وان يك صادقا يصبكم بعض الذي يعدكم ان الله لا يهدي من هو مسرف كذاب ٢٨

Musa was supported by a believing Man from Fir`awn's Family

The well-known view is that this believing man was a Coptic (Egyptian) from the family of Fir`awn. As-Suddi said, he was a cousin son of the paternal uncle of Fir`awn. And it was said that he was the one who was saved along with Musa, peace