Genesis 49:16

Dan shall judge - Dan, whose name signifies judgment, was the eldest of Jacob's sons by Bilhah, Rachel's maid, and he is here promised an equal rule with those tribes that sprang from either Leah or Rachel, the legal wives of Jacob. Some Jewish and some Christian writers understand this prophecy of Samson, who sprang from this tribe, and judged, or as the word might be translated avenged, the people of Israel twenty years. See Judges 13:2; Judges 15:20.

The sons of the handmaids follow those of Leah. "Dan shall judge his people as one of the tribes of Israel." He will maintain his position as a tribe in the state. When threatened by overwhelming power he will put forth his native force for the discomfiture of the foe. The adder is the cerastes or horned serpent, of the color of the sand, and therefore, not easily recognized, that inflicts a fatal wound on him that unwarily treads on it. The few facts in the history of Dan afterward given correspond well with the character here drawn. Some of its features are conspicuous in Samson Judges 13-16. "For thy salvation have I waited, O Lord." The patriarch, contemplating the power of the adversaries of his future people, breaks forth into the expression of his longing desire and hope of that salvation of the Almighty by which alone they can be delivered. That salvation is commensurate with the utmost extent and diversity of these adversaries.

49:16 Dan shall judge his people - Though Dan was one of the sons of the concubines, yet he shall be a tribe governed by judges of his own as well as other tribes; and shall by art and policy, and surprise, gain advantages against his enemies, like a serpent suddenly biting the heel of the traveller.