Numbers 21:13-14
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13 From thence they removed, and pitched on the other side of Arnon, which is in the wilderness that cometh out of the coasts of the Amorites: for Arnon is the border of Moab, between Moab and the Amorites.
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14 Wherefore it is said in the book of the wars of the LORD, What he did in the Red sea, and in the brooks of Arnon,