'Faithful' in the Bible

faithful is God, through whom ye were called to the fellowship of His Son Jesus Christ our Lord.

and as to the rest, it is required in the stewards that one may be found faithful,

because of this I sent to you Timotheus, who is my child, beloved and faithful in the Lord, who shall remind you of my ways in Christ, according as everywhere in every assembly I teach.

And concerning the virgins, a command of the Lord I have not; and I give judgment as having obtained kindness from the Lord to be faithful:

No temptation hath taken you -- except human; and God is faithful, who will not suffer you to be tempted above what ye are able, but He will make, with the temptation, also the outlet, for your being able to bear it.