There is no “sola ecclesia” in Scripture either. Both are wrong to use “sola” (only). What should be used is “prima” (primarily).
In support of Prima Scriptura - 2 Timothy 3:16-17
All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work.
In support of Prima Ecclesia - 2 Thessalonians 2:15 ESV
So then, brothers, stand firm and hold to the traditions that you were taught by us, either by our spoken word or by our letter.
Both have their place for a Christian. What a Christian needs to decide for themselves, is which is to be followed should a conflict between the two arise.
—-> What a Christian needs to decide for themselves, is which is to be followed should a conflict between the two arise.
If any church opposes a clear statement in Scripture by substituting its own, it is an apostate church and the true believer must leave.
2 Thessalonians 2:15 literal Greek translation…
“So then, brethren, be constantly standing firmly, and be holding fast to the teachings which were delivered to you to be passed on to others, which you were taught either orally or through our letter.”
The Thessalonians were taught by Paul and by the Scriptures.
These were not made up traditions.