Numbers 21:15

ואשר הנחלים THE DISCHARGE IN THE VALLEYS — The Targum translation of ,שפך “pouring forth”, is אשר. Consequently these words signify “the pouring forth in the valleys”, for at that place there was poured forth the blood of the Amorites who had concealed themselves there. As the mountains were high and the valley deep and narrow, and the mountains were so close to one another, that a man could stand upon the mountain on one side and speak to his fellow on the other mountain, and the road passed through the valley, the Amorites said: When the Israelites are about to enter the land by passing through the valley we will come out of the mountain caves above them and will kill them by arrows and stone missiles. Now those caves were in the mountains on the Moabite side, and on the mountain that was on the Amorite side there were, opposite those caves, projections like horns and breasts jutting out. When Israel were on the point of passing, the mountain that was located in the land of Israel (that on the Amorite side which afterwards came into the possession of the Israelites) was set in tremor as a handmaid that goes forth to receive her mistress, and moved nearer to the mountain of Moab, and these breast-like projections penetrated into the caves and killed them (the Amorites who were hidden in them). And this is the meaning of אשר נטה לשבת ער which inclineth towards the dwelling (location) of Ar (the capital Moab) — which means that the mountain inclined from its place and approached close to the mountain on the Moabite side and affixed itself to it: and this, too, is the meaning of ונשען לגבול מואב, and leaneth towards the boundary of Moab (Midrash Tanchuma, Chukat 20; cf. Berakhot 54b).

וְאֶ֙שֶׁד֙ הַנְּחָלִ֔ים אֲשֶׁ֥ר נָטָ֖ה לְשֶׁ֣בֶת עָ֑ר וְנִשְׁעַ֖ן לִגְב֥וּל מוֹאָֽב׃

And the stream of the wadis that goes down to the dwelling of ῾Ar, and lies upon the border of Mo᾽av.