'Faithful' in the Bible

to the saints and faithful brothers in Christ at Colossae: Grace to you and peace from God our Father, and the Lord Jesus Christ.

even as you learned of Epaphras our beloved fellow servant, who is a faithful servant of Christ on our behalf,

All my affairs will be made known to you by Tychicus, the beloved brother, faithful servant, and fellow bondservant in the Lord.

together with Onesimus, the faithful and beloved brother, who is one of you. They will make known to you everything that is going on here.