Mark 13:4

13:4 “Tell us, when will these things happen? And what will be the sign that all these things are about to take place?”

Mark 13:22

13:22 For false messiahs and false prophets will appear and perform signs and wonders to deceive, if possible, the elect.

Mark 16:17

16:17 These signs will accompany those who believe: In my name they will drive out demons; they will speak in new languages;