'Faithful' in the Bible

And the faithful of the circumcision were astonished, as many as came with Peter, that upon the nations also the gift of the Holy Spirit was poured out:

When he arrived, he rejoiced to see what the grace of God had done, and with hearty determination he kept encouraging all of them to remain faithful to the Lord,

Since He raised Him from the dead, never to return to decay, He has spoken in this way, I will grant you the faithful covenant blessings made to David.

And when she was baptized, and her household, she besought us, saying, If ye have judged me to be faithful to the Lord, come into my house, and abide there. And she constrained us.

But even the sacrifice of my life I count as nothing, if only I may perfect my earthly course, and be faithful to the duty which the Lord Jesus has entrusted to me of proclaiming, as of supreme importance, the Good News of God's grace.

On the following night the Lord stood near Paul and said, “Be brave; for as you have solemnly and faithfully witnessed about Me at Jerusalem, so you must also testify at Rome.”

And this is just what I did in Jerusalem; I not only locked up many of the saints (God’s people) in prison after receiving authority from the chief priests, but also when they were being condemned to death, I cast my vote against them.