NET
51 He continued, “I tell all of you the solemn truth—you will see heaven opened and the angels of God ascending and descending on the Son of Man.”
Darby
51 And he says to him, Verily, verily, I say to you, Henceforth ye shall see the heaven opened, and the angels of God ascending and descending on the Son of man.
KJV
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.”