'In Christ' in the Bible

and was unknown, as touching my person, unto the congregations of Jewry, which were in Christ.

and that because of incomers, being false brethren, which came in among others to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage.

For ye are all the sons of God, by the faith which is in Christ Jesus.

Now is there no Jew, neither gentile, there is neither bond nor free, there is neither man nor woman: but ye are all one thing in Christ Jesus.

For in Christ Jesus nether circumcision availeth any thing at all nor uncircumcision: but a new creature.