forepromise means A promise made in advance.
Etymology
From fore- + promise (noun).
noun
- A promise made in advance“The present passage is important as bringing the regenerating work of the Holy Ghost into direct relation to the resurrection of the body as a forepromise of that final deliverance [...]”
verb
- To promise beforehand or in advance“For so God did forepromise in the prophet Isaiah [chap. lxvi.], “ Behold, I will let p'eace into Jerusalem like a waterflood,” die. And in Psalm lxxi. “ In his time righteousness shall flourish, yea and abundance of peace," &c.”