Is There a Heaven?
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Matthew 5 (NIV)
3    "Blessed are the poor in spirit, for theirs is the kingdom of heaven.
10  Blessed are those who are persecuted because of righteousness, for theirs is the kingdom of heaven.
11  Blessed are you when people insult you, persecute you and falsely say all kinds of evil against you because of me.
12  Rejoice and be glad, because great is your reward in heaven, for in the same way they persecuted the prophets who were before you.
19  Anyone who breaks one of the least of these commandments and teaches others to do the same will be called least in the kingdom of heaven, but whoever practices and teaches these commands will be called great in the kingdom of heaven.
20  For I tell you that unless your righteousness surpasses that of the Pharisees and the teachers of the law, you will certainly not enter the kingdom of heaven.

In this section Jesus is speaking in public.  He only has time to make a few important points.  He says 1) there's a heaven, 2) not everyone goes there, 3) it's a place where some are respected more than others, 4) the people who were running things on earth weren't doing the right thing.
Luke 2
11  Today in the town of David a Savior has been born to you; he is Christ the Lord.
12  This will be a sign to you: You will find a baby wrapped in cloths and lying in a manger."
13  Suddenly a great company of the heavenly host appeared with the angel, praising God and saying,
14  Glory to God in the highest, and on earth peace to men on whom his favor rests."
15  When the angels had left them and gone into heaven, the shepherds said to one another, "Let's go to Bethlehem and see this thing that has happened, which the Lord has told us about."
16  So they hurried off and found Mary and Joseph, and the baby, who was lying in the manger.
This section is interesting because it says the angels were able to move between earth and heaven.