John 10:7-10

Therefore Jesus said again, "Very truly I tell you, I am the gate for the sheep. All who have come before me are thieves and robbers, but the sheep have not listened to them. I am the gate; whoever enters through me will be saved. They will come in and go out, and find pasture. The thief comes only to steal and kill and destroy; I have come that they may have life, and have it to the full." 

Very truly I tell you, I am 
John 8:58  "Very truly I tell you," Jesus answered, "before Abraham was born, I am!"

the gate for the sheep 
John 10:9  "I am the gate; whoever enters through me will be saved. They will come in and go out, and find pasture."

All who have come before me 
Jeremiah 23:1-2  "Woe to the shepherds who are destroying and scattering the sheep of my pasture!" declares the LORD. Therefore this is what the LORD, the God of Israel, says to the shepherds who tend my people: "Because you have scattered my flock and driven them away and have not bestowed care on them, I will bestow punishment on you for the evil you have done," declares the LORD.
Ezekiel 34:2  "Son of man, prophesy against the shepherds of Israel; prophesy and say to them: 'This is what the Sovereign LORD says: Woe to you shepherds of Israel who only take care of yourselves! Should not shepherds take care of the flock?' "

are thieves and robbers 
John 10:1  "Very truly I tell you Pharisees, anyone who does not enter the sheep pen by the gate, but climbs in by some other way, is a thief and a robber."

I have come that they may have life 
John 1:4  In him was life, and that life was the light of all mankind.
John 3:16  For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.
John 20:30-31  Jesus performed many other signs in the presence of his disciples, which are not recorded in this book. But these are written that you may believe that Jesus is the Messiah, the Son of God, and that by believing you may have life in his name.

and have it to the full 
Romans 5:17  For if, by the trespass of the one man, death reigned through that one man, how much more will those who receive God's abundant provision of grace and the gift of righteousness reign in life through the one man, Jesus Christ!

Scriptures taken from the Holy Bible, New International Version® NIV®, 
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