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 send it.
Isaiah 55:11

I (God) create the fruit of your lips Isaiah 57:19

God says that His Word will not return to Him
void. We return his word to him by speaking it.
And He will create the fruit of our lips. (He will
create what we are speaking which is his word).