(13) On the other side of Arnon.--Better, by the side of the Arnon. (Comp. Deuteronomy 2:24; Deuteronomy 2:26.) The Hebrew word which is here used does not determine on which side of the Arnon the encampment was. (Comp. Numbers 22:1, and Note.)

Verse 13. - Pitched on the other side of Arnon. The Arnon was without doubt the stream or torrent now known as the Wady Mojeb, which breaks its way down to the Salt Sea through a precipitous ravine. It must have been in the upper part of its course, in the desert uplands, that the Israelites crossed it; and this both because the passage lower down is extremely difficult, and also because they were keeping well to the eastward of Moabitish territory up to this point. It is not certain which side of the stream is intended by "the other side," because the force of these expressions depends as often upon the point of view of the writer as of the reader. It would appear from Deuteronomy 2:26 that Israel remained at this spot until the embassage to Sihon had returned. That cometh out of the coasts of the Amorites, i.e., the Aruon, or perhaps one of its confluents which comes down from the northeast. For Arnon is the border of Moab. It was at that time the boundary (see on verse 26).

21:10-20 We have here the removes of the children of Israel, till they came to the plains of Moab, from whence they passed over Jordan into Canaan. The end of their pilgrimage was near. They set forward. It were well if we did thus; and the nearer we come to heaven, were so much the more active and abundant in the work of the Lord. The wonderful success God granted to his people, is here spoken of, and, among the rest, their actions on the river Arnon, at Vaheb in Suphah, and other places on that river. In every stage of our lives, nay, in every step, we should notice what God has wrought for us; what he did at such a time, and what in such a place, ought to be distinctly remembered. God blessed his people with a supply of water. When we come to heaven, we shall remove to the well of life, the fountain of living waters. They received it with joy and thankfulness, which made the mercy doubly sweet. With joy must we draw water out of the wells of salvation, Isa 12:3. As the brazen serpent was a figure of Christ, who is lifted up for our cure, so is this well a figure of the Spirit, who is poured forth for our comfort, and from whom flow to us rivers of living waters, Joh 7:38,39. Does this well spring up in our souls? If so, we should take the comfort to ourselves, and give the glory to God. God promised to give water, but they must open the ground. God's favours must be expected in the use of such means as are within our power, but still the power is only of God.From thence they removed, and pitched on the other side of Arnon,.... A river on the borders of Moab:

which is in the wilderness that cometh out of the coasts of the Amorites; according to Jarchi, they went round the land of Moab, all to the south and east, and came not into the border of Moab, as Jephthah said, Judges 11:18 but before they came hither they had a station at Almondiblathaim, Numbers 33:46.

for Arnon is the border of Moab, between Moab and the Amorites; a river which divided these two countries, and bounded them; and Moses is the more particular in this account, to show that the Israelites took nothing from the Moabites, but what the Amorites had taken from them, they being charged not to distress the Moabites and Ammonites, Deuteronomy 2:9, see Jephthah's defence, Judges 11:15.