Commentaries:
Jamieson, Fausset, and Brown
covenant of the day—that is, covenant with the day: answering to "covenant with David" (Jeremiah 33:21, also Jeremiah 33:25, "with day"; compare Jeremiah 31:35-36; Leviticus 26:42; Psalms 89:34, Psalms 89:37).
Other Jamieson, Fausset, and Brown entries containing Jeremiah 33:20:
Isaiah 55:3
Jeremiah 31:36
Revelation 20:6
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