'In Christ' in the Bible

And so became a pattern to all who believed in Christ throughout Macedonia and Greece.

You will bear witness, and God also, that our relations with you who believed in Christ were pure, and upright, and beyond reproach.

This, too, is a reason why we, on our part, are continually thanking God--because, in receiving the teaching that you had from us, you accepted it, not as the teaching of man, but as what it really is--the teaching of God, which is even now doing its work within you who believe in Christ.

Under all circumstances give thanks to God. For this is his will for you as made known in Christ Jesus.