'Versed' in the Bible

Then the Jews were perplexed. They said, “How did this man become learned [so versed in the Scriptures and theology] without formal training?”

Now a Jew named Apollos, a native of Alexandria, came to Ephesus. He was an eloquent and cultured man, and well versed in the [Hebrew] Scriptures.

For the report of your obedience has reached everyone, so that I rejoice over you, but I want you to be wise in what is good and innocent in what is evil.