Isaiah 55:11 in the King James Version
So shall my word be that goeth forth out of my mouth: it shall not return unto me void, but it shall accomplish that which I please, and it shall prosper in the thing whereto I sent it.
Context
10 For as the rain comes down and the snow from the sky, and doesn’t return there, but waters the earth, and makes it grow and bud, and gives seed to the sower and bread to the eater;
11 so is my word that goes out of my mouth: it will not return to me void, but it will accomplish that which I please, and it will prosper in the thing I sent it to do.
12 For you shall go out with joy, and be led out with peace. The mountains and the hills will break out before you into singing; and all the trees of the fields will clap their hands.