First of all: what is in Torah are the teachings of God to Israel. Torah today contains these teachings. There are no Torah (Torah is the five books of Moses only)scrolls older than the 10th. cent.
Most of Torah is oral teaching, which was passed down orally until the 3rd. cent A.D. when the oral Torah was finally written down. It is tradition that confirms that Torah today represents what God gave to Elijah.
The Church in the 3rd. century had no access to the Hebrew "bible" because there were no gentile Hebrew scholars in the Church - they had all been kicked out of the Church by then, and they wrote the "Old Testament" - the version that is in most English Bibles - from a Greek document called the Septuagint, which was a translation of Jewish documents with a few Greek additional books thrown in. It was condemned by the Judean authorities.
What Elijah did was teach the people by speaking to them, and most of what he said was not written down until the 5th cent. A.D. when the Babylonian Mishnah was written by the rabbis. Followed by the Jerusalem Mishnah. To see what Elijah taught (that is the Oral teachings,) you have to read a Jewish Bible - The Chumash, Stone edition, or the Etz Hayim, for example, which are five times thicker than the Pentateuch in the English Bible, and contain both Written and Oral Torah.