Matthew

Matthew 3:2 - "And saying, Repent ye: for the kingdom of heaven is at hand."

Mark

Mark 16:20 - "And they went forth, and preached every where, the Lord working with them, and confirming the word with signs following. Amen."

Luke

Luke 10:9 - "And heal the sick that are therein, and say unto them, The kingdom of God is come nigh unto you."

John

John 1:51 - "And he saith unto him, Verily, verily, I say unto you, Hereafter ye shall see heaven open, and the angels of God ascending and descending upon the Son of man."