'Sign' in the Bible

Men will buy fields for money, sign and seal deeds, and call in witnesses in the land of Benjamin, in the environs of Jerusalem, in the cities of Judah, in the cities of the hill country, in the cities of the lowland and in the cities of the Negev; for I will restore their fortunes,’ declares the Lord.”

This will be the sign to you,’ declares the Lord, ‘that I am going to punish you in this place, so that you may know that My words will surely stand against you for harm.’