'Sign' in the Bible

"It will happen, if they will neither believe you nor listen to the voice of the first sign, that they will believe the voice of the latter sign.

I will put a division between my people and your people: by tomorrow shall this sign be."'"

It shall be for a sign to you on your hand, and for a memorial between your eyes, that the law of Yahweh may be in your mouth; for with a strong hand Yahweh has brought you out of Egypt.

It shall be for a sign on your hand, and for symbols between your eyes: for by strength of hand Yahweh brought us forth out of Egypt."

"Speak also to the children of Israel, saying, 'Most certainly you shall keep my Sabbaths: for it is a sign between me and you throughout your generations; that you may know that I am Yahweh who sanctifies you.

It is a sign between me and the children of Israel forever; for in six days Yahweh made heaven and earth, and on the seventh day he rested, and was refreshed.'"