Sentence:  And he said, Certainly I will be with thee; and this shall be a <WSD>token</WSD> unto thee, that I have sent thee: When thou hast brought forth the people out of Egypt, ye shall serve God upon this mountain. 
Meaning of the word marked with <WSD> tags:  Something given or shown as a symbol or guarantee of authority or right; a sign of authenticity, of power, good faith.