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Why did Moshe and Aaron need to use a staff in initiating the plagues?

Why did Moshe and Aaron need to use a staff in initiating the plagues? Such as in שמות פרק ז פסוק יט: יט. וַיֹּאמֶר יְהֹוָה אֶל משֶׁה אֱמֹר אֶל אַהֲרֹן קַח מַטְּךָ וּנְטֵה יָדְךָ עַל מֵימֵי ...