'Add' in the Bible

And he saith, 'Thus doth God do to me, and thus He doth add -- if it remain -- the head of Elisha son of Shaphat -- upon him this day.'

and I do not add to cause the foot of Israel to move from the ground that I gave to their fathers, only, if they observe to do according to all that I commanded them, and to all the law that My servant Moses commanded them.'