Matthew Poole and continuators on Numbers 24:21

21 And he looked on the Kenite , and took up his parable, and said, strong is thy dwelling-place, and thou puttest thy nest in a rock:

The posterity or kindred of Iethro, not that part of them which dwelt among the Israelites, to whom the following words do not agree, but those of them who were mingled with the Amalekites and Midianites. See Exod. 3. 1. Iudg. 1. 16. and 4. 11. 1 Sam. 15. 6.

(i. e.) Thy dwelling-place, so called, either because it was in an high place, as nests commonly are: or from their security and confidence of continuing long and safe in it: See Iob 29. 18. or in allusion to their name, for ken in Hebrew signifies a nest.

Marginal references: 1 Sam. 15. 6.