(Furqan) 25 : 35
وَلَقَدْ آتَيْنَا مُوسَى الْكِتَابَ وَجَعَلْنَا مَعَهُ أَخَاهُ هَارُونَ وَزِيرًا
And surely We had given Moses the Book and appointed with him his brother Haroon as a minister.
See explanation 7: 154 and 20: 25-36.