The following two extended incidents (ch. 17-21) differ from the records of the judges just completed (chs. 3-16). They are not accounts of the activities of any of Israel's judges. They are the record of events that took place during the period of the judges that throw light on conditions in Israel during this era. The purpose behind their inclusion seems to have been to illustrate even more clearly ". . . the low moral standards, . . . the debased religious conceptions and . . . the disordered social structure"in Israel.305
"As was the case in the earlier chapters of the Book of Judges [1:1-3:6], these chapters deal with the subject of spiritual apostasy and its effects upon the nation of Israel."306
Whereas chapters 3-16 record Israel's struggles with her external enemies, chapters 17-21 document the internal conditions of the nation that made her so weak. In chapters 17-18 we see Israel abandoning God, and in chapters 19-21 we see her destroying herself.
The town of Bethlehem features in each of three stories. These stories are Micah and the Danites (chs. 17-18), the Levite and the Benjamites (chs. 19-21), and the story of Ruth in the Book of Ruth. Therefore some scholars refer to this section of Scripture as the "Bethlehem trilogy."These stories also share other themes and motifs.
"They concern individuals in more or less private settings whose identities and activities are nevertheless inseparable from and crucial to a full understanding of the Davidic monarchy which followed them. Accounts of actual events that transpired in the days of the judges, they are included in the sacred record for the purpose of tracing the roots of the Davidic dynasty and justifying its existence in opposition to Saul."307
The first incident (chs. 17-18) describes the fate of the Danites, and the second (chs. 19-21) the fate of the Benjamites. Both tribes received land in Israel's heartland, between Judah and Ephraim, the tribes that would, after the monarchy divided, lead the Southern and Northern Kingdoms respectively. By selecting incidents from these tribes, the narrator showed that the degenerating tendency in Israel was not just a problem in the fringe territories. Canaanite influence had infected the heart of the nation.
Both Dan and Benjamin found themselves in dire straits but for different reasons. The Danites could not settle into their allotted inheritance because of Canaanite influence, and the Benjamites could not remain in theirs because of their hostile Israelite brethren. In both instances a nameless Levite with Bethlehem-Judah (17:7-8; 19:1-2) and Mt. Ephraim (17:1; 19:1) connections precipitated the crisis. Both accounts include priestly characters inquiring of God concerning the outcome of a proposed course of action (18:5-6; 20:27-28), and both conclude with a reference to Shiloh (18:31; 21:19-24). In both accounts military contingents of 800 men play a crucial role (18:11, 16, 25; 20:47; 21:7, 12, 14, 16-17, 23), and both contain references to the absence of a king in Israel (17:6; 18:1; 19:1; 21:25). These parallel phenomena have the effect of making the reader conclude that the Canaanization of Israel had become complete.308