We’re “cherry picking” again. So, I’ll pick a few more cherries.
I don’t think you can use Revelation as an argument against Catechism/ECF, etc.–if that is your intention.
Have you forgotten about the verses quoted, below? We received more instructions, even from Christ Himself, since Deuteronomy.
Deuteronomy 4 (ESV): 1"And now, O Israel, listen to the statutes and the rules that I am teaching you, and do them, that you may live, and go in and take possession of the land that the LORD, the God of your fathers, is giving you. 2
You shall not add to the word that I command you, nor take from it, that you may keep the commandments of the LORD your God that I command you. 3Your eyes have seen what the LORD did at Baal-peor, for the LORD your God destroyed from among you all the men who followed the Baal of Peor.
Deuteronomy 12: 32 "Everything that I command you,
you shall be careful to do. You shall not add to it or take from it.
**Proverbs 30: ** 5 Every word of God proves true; he is a shield to those who take refuge in him. 6
Do not add to his words, lest he rebuke you and you be found a liar.
I have to ask: how much study have you done regarding the transmission of Scripture?
You do realize that the messages contained in written Scripture were transmitted orally, often long before making it to the written page, right?
Anna