'Signs' in the Bible

For there will arise false christs and false prophets, and will show signs and wonders, that they may lead astray, if possible, even the chosen ones.

These signs will accompany those who believe: in my name they will cast out demons; they will speak with new languages;

They went out, and preached everywhere, the Lord working with them, and confirming the word by the signs that followed. Amen.