Once here carries a sense of finality and sufficiency, and the question naturally follows: who gave us this faith? The answer? Christ and His apostles. They are the original bearers of the faith, the source from which all else flows. The faith once delivered—Once here carries a sense of finality and sufficiency. What was given needs no updating, no expansion, and no correction. Once delivered highlights the event's completeness and enduring authority.
The faith was given once for all, and our task is not to rewrite it, but to return.