John 1:50-51

Jesus said, "You believe because I told you I saw  you under the fig tree. You will see greater things than that." He then added, "Very truly I tell you, you will see 'heaven open and the angels of God ascending and descending on' the Son of Man." 

Very truly I tell you, you will see heaven open 
Matthew 3:16  As soon as Jesus was baptized, he went up out of the water. At that moment heaven was opened, and he saw the Spirit of God descending like a dove and alighting on him.
Ezekiel 1:1  In my thirtieth year, in the fourth month on the fifth day, while I was among the exiles by the Kebar River, the heavens were opened and I saw visions of God.
Acts 7:55-56  But Stephen, full of the Holy Spirit, looked up to heaven and saw the glory of God, and Jesus standing at the right hand of God. "Look," he said, "I see heaven open and the Son of Man standing at the right hand of God."
Acts 10:11  He (Peter) saw heaven opened and something like a large sheet being let down to earth by its four corners.
Revelation 4:1  After this I looked, and there before me was a door standing open in heaven. And the voice I had first heard speaking to me like a trumpet said, "Come up here, and I will show you what must take place after this." 
Revelation 19:11  I saw heaven standing open and there before me was a white horse, whose rider is called Faithful and True. With justice he judges and wages war.

and the angels of God ascending and descending 
Genesis 28:12  He (Jacob) had a dream in which he saw a stairway resting on the earth, with its top reaching to heaven, and the angels of God were ascending and descending on it.

on the Son of Man 
Matthew 8:20  Jesus replied, "Foxes have dens and birds have nests, but the Son of Man has no place to lay his head."
Matthew 12:40  "For as Jonah was three days and three nights in the belly of a huge fish, so the Son of Man will be three days and three nights in the heart of the earth."
Matthew 17:9  As they were coming down the mountain, Jesus instructed them, "Don't tell anyone what you have seen, until the Son of Man has been raised from the dead."
Matthew 19:28  Jesus said to them, "Truly I tell you, at the renewal of all things, when the Son of Man sits on his glorious throne, you who have followed me will also sit on twelve thrones, judging the twelve tribes of Israel."
Mark 8:31  He then began to teach them that the Son of Man must suffer many things and be rejected by the elders, the chief priests and the teachers of the law, and that he must be killed and after three days rise again.

(parentheses are mine)

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