It happened in those days, when there was no king in Israel, that there was a certain Levite sojourning on the farther side of the hill-country of Ephraim, who took to him a concubine out of Bethlehem Judah.
If the ASV is correct, then this Levite violated the law of God  (Leviticus 20:10) in taking back an adulteress as his wife.  Although, we cannot dogmatically reject the RSV, the moral climate in which this narrative is set strongly favors retaining the ASV here, as Dalglish suggested.