John 7:33-34

Jesus said, "I am with you for only a short time, and then I am going to the one who sent me. You will look for me, but you will not find me; where I am, you cannot come."

I am with you for only a short time 
John 12:35  Then Jesus told them, "You are going to have the light just a little while longer. Walk while you have the light, before darkness overtakes you. Whoever walks in the dark does not know where they are going." 
John 13:33  "My children, I will be with you only a little longer. You will look for me, and just as I told the Jews, so I tell you now: Where I am going, you cannot come." 
John 16:16  Jesus went on to say, "In a little while you will see me no more, and then after a little while you will see me." 

and then I am going to the one who sent me 
John 16:4b-5  "I have told you this, so that when their time comes you will remember that I warned you about them. I did not tell you this from the beginning because I was with you, but now I am going to him who sent me. None of you asks me, 'Where are you going?' Rather you are filled with grief because I have said these things." 
John 16:10  "... about righteousness, because I am going to the Father, where you can see me no longer; ..."
John 16:17  At this, some of his disciples said to one another, "What does he mean by saying, 'In a little while you will see me no more, and then after a little while you will see me.' and 'Because I am going to the Father'?" 
John 16:28  "I came from the Father and entered the world; now I am leaving the world and going back to the Father."

and where I am you cannot come 
John 8:21-24  Once more Jesus said to them, "I am going away, and you will look for me, and you will die in your sin. Where I go, you cannot come." This made the Jews ask, "Will he kill himself? Is that why he says, 'Where I go, you cannot come'?" But he continued, "You are from below; I am from above. You are of this world; I am not of this world. I told you that you would die in your sins; if you do not believe that I am he, you will indeed die in your sins."

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