Arcana Coelestia # 2687
2687. 'For she said, Let me not see the death of the boy' means grief that [spiritual truth] would thus perish. This is clear from the meaning of 'seeing the death' as perishing, and from the meaning of 'the boy' as spiritual truth, dealt with above. From this and from the feeling of despair because truth has been made desolate it is evident that it is a more interior grief that these words hold within them.
Numbers 21:14-16
14
Therefore it is said in the book of the Wars of Yahweh, "Vaheb in Suphah, the valleys of the Arnon,
15
the slope of the valleys that incline toward the dwelling of Ar, leans on the border of Moab."
16
From there they traveled to Beer: that is the well of which Yahweh said to Moses, "Gather the people together, and I will give them water."