faithful

any loyal and steadfast following

a group of people who adhere to a common faith and habitually attend a given church

steadfast in affection or allegiance; "years of faithful service"; "faithful employees"; "we do not doubt that England has a faithful patriot in the Lord Chancellor"

marked by fidelity to an original; "a close translation"; "a faithful copy of the portrait"; "a faithful rendering of the observed facts"

not having sexual relations with anyone except your husband or wife, or your boyfriend or girlfriend; "he remained faithful to his wife"