New Defender's Study Bible Notes
28:20 good courage. This expression—“be strong and of good courage”—occurs at least eleven times in the Old Testament. It was spoken first by Moses (Deuteronomy 31:6), last by Hezekiah (II Chronicles 32:7). This is still a good admonition today.
28:20 forsake thee. Similarly, the promise—“He will not fail thee, nor forsake thee”—occurs at least four times in the Old Testament, first at Deuteronomy 31:6 and last in this verse. It is quoted in essence in Hebrews 13:5.