Matthew 10:32-33

32 Whosoever therefore shall confess me before men, him will I confess also before my Father which is in heaven.

33 But whosoever shall deny me before men, him will I also deny before my Father which is in heaven.

Luke 12:8-9

8 Also I say unto you, Whosoever shall confess me before men, him shall the Son of man also confess before the angels of God.

9 But he that denieth me before men shall be denied before the angels of God.

Acts 1:8

8 But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.

2 Timothy 1:8

8 Be not thou therefore ashamed of the testimony of our Lord, nor of me his prisoner: but be thou partaker of the afflictions of the gospel according to the power of God;