doctrinal

Of, relating to, involving, belonging to or concerning a doctrine.

Didactic.

The word of God serveth no otherwise than in the nature of a doctrinal instrument.

A matter of doctrine, or system of doctrines.

His Teaching is not to teach you the Doctrinals of Salvation and of the Son, for he leaves that to Ministers, and to the Bible, to teach you the Doctrinals only in a doctrinal way

The Doctrinal of Princes