Do Jude 3 and Galatians 1 rule out the Restoration?

A friend combines Jude’s “faith once delivered” with Paul’s warning about another gospel and an angel. Separate what each passage establishes, then examine the Restoration’s message.

Exchange 1 of 4

“Jude says the faith was once delivered. Doesn’t that prove the canon was closed?”

Jude 3–4 ↗