Mark 9:9

9:9 As they were coming down from the mountain, he gave them orders not to tell anyone what they had seen until after the Son of Man had risen from the dead.

Mark 11:23

11:23 I tell you the truth, ¹  if someone says to this mountain, ‘Be lifted up and thrown into the sea,’ and does not doubt in his heart but believes that what he says will happen, it will be done for him.

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¹ tn Grk “Truly (ἀμήν, amhn), I say to you.”