What is the biblical basis/justification for requiring a pastor be educated?

As a Baptist, while I don't know of any specific requirements for a pastor, it is generally accepted that a head pastor would have some sort of seminary education, be it a Masters or even a Doctorate degree. That is certainly the way that it has been at all of the churches I have attended in America. I understand that the notion of a seminary, at least the sort of seminary that we have today, didn't exist when the Bible was written. But is there any biblical basis for requiring that a pastor or other leader have some level of training or education? I can appreciate the fact that people can serve in different ways regardless of their education or background, but in what ways does the Bible support the pastor or leader being educated?