Jamieson, Fausset and Brown on Jeremiah 11:5

5. oath--(Psa 105:9, 10).

a land flowing with milk and honey--(See on Nu 14:8).

as it is this day--These are the concluding words of God to the Israelites when formerly brought out of Egypt, "Obey ... that I may at this time make good the promise I made to your fathers, to give," &c. [Maurer]. English Version makes the words apply to Jeremiah's time, "As ye know at this time, that God's promise has been fulfilled," namely, in Israel's acquisition of Canaan.

So be it--Hebrew, Amen. Taken from De 27:15-26. Jeremiah hereby solemnly concurs in the justice of the curses pronounced there (see Jr 11:3).