Midrasch zu Schoftim 15:16

Dan shall judge his people like one of the tribes of Israel (Gen. 49:16). Like one signifies that like Judah, he was one of the most distinguished of the tribes. Another explanation of like one of the tribes of Israel. He was like the Unique One of the world, who requires no assistance in battle, as it is said: I have trod the wine press alone (Isa. 43:3). Samson, who descended from Dan, needed no assistance from others, as is said: With the jawbone of an ass have I smitten a thousand men (Judg. 15:16).