Brother of Moses who stretched out his rod in order to bring on the first three plagues, in the Old Testament (5)

I believe the answer is:

aaron

(Other definitions for aaron that I've seen before include "high priest" , "Bearded fellow" , "OT character" , "Brother of Moses who founded the Jewish priesthood" , "Brother of Moses and traditional founder of Jewish priesthood" .)

I've seen this clue in The Independent.

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