'Faithful' in the Bible

He will guard the feet of his faithful ones, but the wicked will be destroyed in the darkness, because a man will not prevail by [his] might.

All Israel from Dan to Beersheba realized that Samuel was faithful as a prophet to Yahweh.

But Ahimelech answered the king and said, "And who among all your servants [is] as faithful as David? He [is] the son-in-law of the king who moves [quickly] to safeguard you and is honored in your house.