'Faithful' in the Bible

Therefore he was obligated in all things to be made like his brothers, that he might become a merciful and faithful high priest in things pertaining to God, to make atonement for the sins of the people.

who was faithful to him who appointed him, as also was Moses in all his house.

Moses indeed was faithful in all his house as a servant, for a testimony of those things which were afterward to be spoken,

but Christ is faithful as a Son over his house; whose house we are, if we hold fast our confidence and the glorying of our hope firm to the end.

let us hold fast the confession of our hope without wavering; for he who promised is faithful.

By faith, even Sarah herself received power to conceive, and she bore a child when she was past age, since she counted him faithful who had promised.