Isaiah
Isaiah 55:11BSB·traditional attribution

so My word that proceeds from My mouth will not return to Me empty, but it will accomplish what I please, and it will prosper where I send it.

Matthew Henry Presbyterian @wholebiblehenry

We have here a further account of that covenant of grace which is made with us in Jesus Christ, both what is required and what is promised in the covenant, and of those considerations that are sufficient abundantly to confirm our believing compliance with and reliance on that covenant.

Commenting on Isaiah 55:6-13

John Gill Reformed Baptist @doctorgill

So shall my word be that goeth forth out of my mouth,.... My good word, as the Targum; this may either be understood of Christ, the eternal Word, who is called the Word of God, and may be said to go forth out of his mouth, being spoken of by all his holy prophets, since the world began, whose coming was like the rain or...

Jamieson-Fausset-Brown Reformed @jfbcommentary

(Mat 24:35). Rain may to us seem lost when it falls on a desert, but it fulfils some purpose of God. So the gospel word falling on the hard heart; it sometimes works a change at last; and even if so, it leaves men without excuse.