Charles Ellicott Commentary Malachi 3:4

"Then shall the offering of Judah and Jerusalem be pleasant unto Jehovah, as in the days of old, and as in ancient years." — Malachi 3:4 (ASV)

Days of old ... former years. —Perhaps, if we must define the period, from the time of Moses to the first year of the reign of Solomon. But we cannot be certain on this point. It seems to be one of the characteristics of Malachi to be somewhat of a laudator temporis acti .