snHeb “the ancient path.” This has already been referred to in Jer 6:16. There is another “old way” but it is the path trod by the wicked (cf. Job 22:15).
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snHeb “ways that are not built up.” This refers to the built-up highways. See Isa 40:4 for the figure. The terms “way,” “by-paths,” “roads” are, of course, being used here in the sense of moral behavior or action.