[Pooya/Ali Commentary 28:44] The valley of Tuwa where Musa was commissioned as prophet is situated in Sinai. Refer to Aqa Puya's note in the commentary of Maryam : 16 to 40. Here, the Holy Prophet is addressed "O Our Messenger Muhammad you were not physically present when Musa was appointed prophet to have witnessed that event to have it related to the people as you do it now." Several generations and a lot of time had passed between Musa and the Holy Prophet yet he had the inspired knowledge of the distant and obscure past. This is to indicate that he is none else other than a prophet of Allah.