'In Christ' in the Bible

to the saints at Colosse, and to the faithful brethren in Christ: grace be unto you, and peace from God our Father, and the Lord Jesus Christ.

having heard of your faith in Christ Jesus, and the love ye show to all the saints;

whom we preach, warning every man, and teaching every man in all wisdom, that we may present every man perfect in Christ Jesus;

For though I am absent from you in person, yet I am present with you in spirit, rejoicing and beholding your regular order, and the stedfastness of your faith in Christ.