'Faithful' in the Bible

Therefore he had to be made like his brothers and sisters in every respect, so that he could become a merciful and faithful high priest in things relating to God, to make atonement for the sins of the people.

who is faithful to the one who appointed him, as Moses was also in God's house.

Now Moses was faithful in all God's house as a servant, to testify to the things that would be spoken.

But Christ is faithful as a son over God's house. We are of his house, if in fact we hold firmly to our confidence and the hope we take pride in.