Has God REALLY said......
That was about the only time that "oral tradition" alone was foremost in play. And perhaps with Abram, until the time of Moses.
Since then, private revelation from God, one would need test with scripture -- and still should, but test it not with "SOLO scriptura", but exegesis of a wider sense, along with some room for tradition, and traditional understandings. Yet even there, as best as we can, we must let the Word do what it will, for it is His Word, and shall not return to Him void.