'Adds' in the Bible

I am telling you the truth as a Christian man--it is no falsehood, for my conscience enlightened, as it is, by the Holy Spirit adds its testimony to mine--

He then adds, "I have come to do Thy will." He does away with the first in order to establish the second.

He adds, "And their sins and offences I will remember no longer."

"I solemnly declare to every one who hears the words of the prophecy contained in this book, that if any one adds to those words, God will add to him the plagues spoken of in this book;