Esias 59:21

21 And this shall be my covenant with them, said the Lord; My Spirit which is upon thee, and the words which I have put in thy mouth, shall never fail from thy mouth, nor from the mouth of thy seed, for the Lord has spoken it, henceforth and for ever.

Esias 59:21 In-Context

19 So shall they of the west fear the name of the Lord, and they from the rising of the sun his glorious name: for the wrath of the Lord shall come as a mighty river, it shall come with fury.

20 And the deliverer shall come for Sion's sake, and shall turn away ungodliness from Jacob.

21 And this shall be my covenant with them, said the Lord; My Spirit which is upon thee, and the words which I have put in thy mouth, shall never fail from thy mouth, nor from the mouth of thy seed, for the Lord has spoken it, henceforth and for ever.