Obama gave the press corpse a slip, probably because he was going to the buttcrack of nowhere for the G-8, and this is how the WSJ characterized it:
It is highly unusual for the president to shun his permanent media detail that way, particularly at a high-profile event in a remote location.
Courtesy of Wikipedia, here are a few of the New Testament verses which serve as the basis for shunning:
2Thessalonians 3:6: In the name of the Lord Jesus Christ, we command you, brothers, to keep away from every brother who is idle and does not live according to the teaching you received from us.
Romans 16:17: I urge you, brothers, to watch out for those who cause divisions and put obstacles in your way that are contrary to the teaching you have learned. Keep away from them.
2John 10–11, NASB: If anyone comes to you and does not bring this teaching, do not receive him into your house, and do not give him a greeting; for the one who gives him a greeting participates in his evil deeds.
I’m not a biblical scholar, but some of those sound pretty close to the mark. Thanks to Joseph Nobles for the link.