When I teach Christian writing classes, I emphasize the importance of Bible study. Christian writers have an incredible privilege of inspiring and encouraging readers to draw closer to God and to dig deeper into His Word. That means writers need to know the Bible and have a solid foundation for presenting scripture in their writing.
This doesn’t mean a devotional writer needs to be a scholar of biblical texts. But there are some basics that anyone writing about scripture needs to practice. One of these is the use of reliable biblical commentaries.