Westminster Confession, week 3 « Daily Confession
Chapter 1: Of the Holy Scripture
8: The Old Testament in Hebrew (which was the native language of the people of God of old), and the New Testament in Greek (which, at the time of the writing of it, was most generally known to the nations), being immediately inspired by God, and, by His singular care and providence, kept pure in all ages, are therefore authentical; so as, in all controversies of religion, the Church is finally to appeal unto them. But, because these original tongues are not known to all the people of God, who have right unto, and interest in the Scriptures, and are commanded, in the fear of God, to read and search them, therefore they are to be translated in to the vulgar language of every nation unto which they come, that, the Word of God dwelling plentifully in all, they may worship Him in an acceptable manner; and, through patience and comfort of the Scriptures, may have hope.
9: The infallible rule of interpretation of Scripture is the Scripture itself: and therefore, when there is a question about the true and full sense of any Scripture (which is not manifold, but one), it must be searched and known by other places that speak more clearly.
10: The supreme judge by which all controversies of religion are to be determined, and all decrees of councils, opinions of ancient writers, doctrines of men, and private spirits, are to be examined, and in whose sentence we are to rest, can be no other but the Holy Spirit speaking in the Scripture.