Mark 8:11-12

11 And the Pharisees came forth, and began to question with him, seeking of him a sign from heaven, tempting him.
12 And he sighed deeply in his spirit, and saith,Why doth this generation seek after a sign? verily I say unto you, There shall no sign be given unto this generation.
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Mark 13:4

4 Tell us, when shall these things be? and what shall be the sign when all these things shall be fulfilled?
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Mark 13:22

22 For false Christs and false prophets shall rise, and shall shew signs and wonders, to seduce, if it were possible, even the elect.
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Mark 16:17

17 And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues;
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Mark 16:20

20 And they went forth, and preached every where, the Lord working with them, and confirming the word with signs following. Amen.
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