'Faithful' in the Bible

Wherefore in all things it behoved him to be made like unto his brethren, that he might be a merciful and faithful high priest in things pertaining to God, to make reconciliation for the sins of the people.

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

And Moses verily was faithful in all his house, as a servant, for a testimony of those things which were to be spoken after;

Let us hold fast the profession of our faith without wavering; (for he is faithful that promised;)

Through faith also Sara herself received strength to conceive seed, and was delivered of a child when she was past age, because she judged him faithful who had promised.