ثُمَّ أَرْسَلْنَا مُوسَىٰ وَأَخَاهُ هَارُونَ بِآيَاتِنَا وَسُلْطَانٍ مُّبِينٍ (45)
(23:45) Then We sent Moses and his brother Aaron with Our Signs and a clear Authority *39
*39) The use of "a clear Authority" along with "Our Signs" may either mean that the "Signs" were a clear proof that they were Messengers of Allah, or the "Signs" may refer to all other miracles of Prophet Moses than the "staff', which may stand here for a clear Authority, because the miracles shown by means of it were a clear proof that the two brothers had been sent by Allah.