Indeed, We gave Moses the knowledge of the reality and the instructions of application, and appointed his brother Aaron as an assistant.
Sayyed Abbas Sadr-Ameli
And indeed We gave Moses the Book and We appointed His brother Aaron with him (as his) assistant
Al-muntakhab fi tafsir al-Qur'an al-Karim
They are not different from those to whom We sent Mussa (Moses). We gave Mussa the Book -AL-Tawrah (The Torah)- and We supported him with his brother Harun (Aaron) whom We appointed a minister to be helpful and conducive to his brother to accomplish his mission