When we say the Bible is infallible in its origin, we are merely ascribing its origin to a God who is infallible. This is not to say that the Bible writers were intrinsically or in themselves infallible. They were human beings who, like other humans, proved the axiom Errare humanum est, “To err is human.” It is precisely because humans are given to error that, for the Bible to be the Word of God, its human authors required assistance in their task.
Sproul, R.C.; Grace Unknown: The Heart of Reformed Theology; Baker Books; Grand Rapids, MI; copyright 1997; p. 46