No, it's not directly biblical, but, they would argue, it is biblically based. They say that they want to avoid accepting an unsaved person as saved, because that has dangerous potential. Especially if they are some sort of heretic, who will pick apart baptist beliefs.They simply want to know if the person joining their community, left the other church because of something like inappropriate behavior, or huge doctrinal disputes.Of course, this is only practiced for people who wish to be involved in Church politics, and become official members. I'm a member of a Baptist church myself. If I ever want to change churches, for whatever reason, then I might, depending, require them to write a letter on my behalf.But no, there is no direct support in the scriptures, there is simply, what they argue, is an outline leading them to do this to keep order within the Church. In a sense, it's a fairly sound doctrine, but is not "commanded" though nothing is truly commanded in the absolute.In hope,~Tyrel