Yes, absolutely nothing about the movement of the rock that Moses struck.
No but there is a rock again years later in Kadesh 250 km away producing water again ! Something not nothing.
Look most good traditions have scriptural basis or backing.
I do not deny the Hagadah tradition/legend.
I would also say Paul knew of this tradition/legend.
Does he authenticate it, rely on it, or use it ?
Does he distinguish the legend from truth by calling it "spiritual "rock, a metaphorical rock?
Was he led by the Spirit to authenticate the legend, to say it was a literal, spiritual rock and if so, because of other scripture, namely numbers 20:8, or because of the legend ?
RELIES on Rabbinic tradition to show how this rock followed them on their journey through the wilderness.
Again I prefer “use” not “rely” for he relies on the Holy Spirit.
For the sake of argument however, supposing you are right, scripture authenticates the "reliance’’ on certain traditions, even legends. Does that mean that tradition/legend, though not directly authenticated by scripture, are authentic and truthful in themselves ?
Does it establish their equality with Holy Writ ?
I think not , for as JonC points out, it is scripture doing the authenticating.
As mentioned in previous post ,just because scripture may use a tradition/legend .or mythology or "all things’ or "current events’’ does not raise them to the level of Holy Writ’s inspiration and authority
Remember Jesus’ words, " you have HEARD it said…" Not you have “read”.
Again, there is still some powerful oral transmission today, that wonderfully saves.