'Sign to You' in the Bible

And He said, I will be with you. And this shall be the sign to you that I have sent you: When you have brought forth the people out of Egypt, you shall serve God upon this mountain.

And the blood shall be a sign to you upon the houses where you are. And when I see the blood, I will pass over you. And the plague shall not be upon you for a destruction when I smite in the land of Egypt.

And it shall be a sign to you upon your hand, and for a memorial between your eyes, that Jehovah's Law may be in your mouth. For the Lord has brought you out of Egypt with a strong hand.