'In Christ' in the Bible

and was not known in person to the churches of Judea, which were in Christ.

and that because of the false brethren clandestinely introduced, who had crept in as spies upon our liberty, which we have in Christ Jesus, that they might bring us into bondage:

knowing that a man is not justified by the works of the law, but by faith in Jesus Christ, even we have believed in Christ Jesus, that we might be justified by faith in Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.

For ye are all the children of God by faith in Christ Jesus.

and there is neither Jew nor Greek, those is neither bond nor free, there is neither male nor female; for ye are all one in Christ Jesus.

For in Christ Jesus neither circumcision availeth any thing, nor uncircumcision, but faith which worketh by love.

For in Christ Jesus neither circumcision availeth any thing, nor uncircumcision, but being created anew.