'Descending' in the Bible

John testified, saying, "I have seen the Spirit descending like a dove out of heaven, and it remained on him.

I didn't recognize him, but he who sent me to baptize in water, he said to me, 'On whomever you will see the Spirit descending, and remaining on him, the same is he who baptizes in the Holy Spirit.'

He said to him, "Most certainly, I tell you, hereafter you will see heaven opened, and the angels of God ascending and descending on the Son of Man."