Deuteronomy 31:29

(29) In the latter days.—A not uncommon prophetical expression, used with some considerable latitude. It occurs for the first time in Genesis 49:1. (See also Numbers 24:14 and Deuteronomy 4:30. ) Some would refer it to the “days of the Messiah,” and make it almost a technical term. But a comparison of these few passages will show that it cannot be tied strictly to any one period.