It is ALL OVER the new testament, dude! It's what the WHOLE NEW TESTAMENT IS ABOUT!
One of the things Christ was sent down here to do was to bring us out from under the Law, sola gratia. To write the Lord's commandments on our hearts. So that we will want to serve Him not because of our needs, but because of what He did on the cross for us. That can only be done through the Spirit as man's unregenerant heart runs from God.
It is ALL OVER the new testament, dude! It's what the WHOLE NEW TESTAMENT IS ABOUT!
Then it shouldn't be hard to find one mention of "personal relationship with Christ." (Please note the quotation marks.)
Jesus commands us to love God with our whole heart and mind and to love our neighbor as ourselves. We are also to "pray constantly." If that's what you mean by "personal relationship with Christ," then I'm with you.