Mark 13:21

13:21 Then if anyone says to you, ‘Look, here is the Christ!’ or ‘Look, there he is!’ do not believe him.

Mark 1:15

1:15 He said, “The time is fulfilled and the kingdom of God is near. Repent and believe the gospel!”

Mark 11:24

11:24 For this reason I tell you, whatever you pray and ask for, believe that you have received it, and it will be yours.