36:21 mouth of Jeremiah. This prophecy by Jeremiah of a seventy year captivity is found in Jeremiah 25:11 and 29:10. See also Daniel 9:2.

36:21 threescore and ten years. The law had required that the land be allowed to “rest” every seventh year (Leviticus 25:4). Evidently this law had been ignored for some 490 or so years, since about the time of Solomon. Therefore God enforced the law in this most impressive way.