Jeremias 18:9

9 And I shall pronounce a decree upon a nation and kingdom, to rebuild and to plant ;

Jeremias 18:9 Meaning and Commentary

Jeremiah 18:9

And [at what] instant I shall speak concerning a nation, and
concerning a kingdom
By way of promise on the other hand: or, "and the moment I shall speak" as in ( Jeremiah 18:7 ) ; in favour to a people; signifying, that if they do that which is right and good, and continue therein, it may be expected that I will appear for and among such a nation and kingdom: to build and to plant [it];
to build up its fences that have been broken down, and to plant it with pleasant plants, and make it prosperous and flourishing, and protect and defend it, and keep it safe, and in a secure condition; so that it shall be in very thriving circumstances, and be out of the power of its enemies to hurt it.

Jeremias 18:9 In-Context

7 I shall pronounce a decree upon a nation, or upon a kingdom, to cut them off, and to destroy ;
8 and that nation turn from all their sins, then will I repent of the evils which I purposed to do to them.
9 And I shall pronounce a decree upon a nation and kingdom, to rebuild and to plant ;
10 and they do evil before me, so as not to hearken to my voice, then will I repent of the good which I spoke of, to do it to them.
11 And now say to the men of Juda, and to the inhabitants of Jerusalem, Behold, I prepare evils against you, and devise a device against you: let every one turn now from his evil way, and amend your practices.

The Brenton translation of the Septuagint is in the public domain.