Deuteronomy 32:30

How should one chase a thousand, and two put ten thousand to flight, except their Rock had sold them, and the LORD had shut them up?

How should one chase a thousand ... The express promise given to Israel, on condition of their religious allegiance to God, that 5 of that people should, by His miraculous aid, chase 100 of their enemies (Leviticus 26:8), would not be fulfilled, and they would be ignominiously defeated and trampled upon by a handful of enemies. The reason was, that God, their great and only refuge would withdraw His protection and dissolve His relation to them, so that they would fall into the power of their enemies, and be sold for slaves, having been 'shut up' in the net laid for them.