See William H. Propp, “The Rod of Aaron and the Sin of Moses,” Journal of Biblical Literature (March 1988), pp. 19–26 Jacob Milgrom, “Magic, Monotheism and the Sin of Moses,” in The Quest for the Kingdom of God: Studies in Honor of George E. Mendenhall, ed. H.B. Huffmon (Winona. Lake, IN: Eisenbrauns, 1983), pp. 251–265; M. Margaliot, “The Transgression of Moses and Aaron—Num. 20:1–13, ” Jewish Quarterly Review 74 (1983), pp. 196–228.