Esias 55:11

11 so shall my word be, whatever shall proceed out of my mouth, it shall by no means turn back, until all the things which I willed shall have been accomplished; and I will make thy ways prosperous, and my commands.

Esias 55:11 In-Context

9 But as the heaven is distant from the earth, so is my way distant from your ways, and your thoughts from my mind.
10 For as rain shall come down, or snow, from heaven, and shall not return until it have saturated the earth, and it bring forth, and bud, and give seed to the sower, and bread for food:
11 so shall my word be, whatever shall proceed out of my mouth, it shall by no means turn back, until all the things which I willed shall have been accomplished; and I will make thy ways prosperous, and my commands.
12 For ye shall go forth with joy, and shall be taught with gladness: for the mountains and the hills shall exult to welcome you with joy, and all the trees of the field shall applaud with their branches.
13 And instead of the bramble shall come up the cypress, and instead of the nettle shall come up the myrtle: and the Lord shall be for a name, and for an everlasting sign, and shall not fail.

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