Genesis 49:16

16.Dan shall judge his people. In the word judge there is an allusion to his name: for since, among the Hebrews, דון (din) signifies to judge, Rachel, when she returned thanks to God, gave this name to the son born to her by her handmaid, as if God had been the vindicator of her cause and right. Jacob now gives a new turn to the meaning of the name; namely, that the sons of Dan shall have no mean part in the government of the people. For the Jews foolishly restrict it to Samson, because he alone presided over the whole people, whereas the language rather applies to the perpetual condition of the tribe. Jacob therefore means, that though Dan was born from a concubine, he shall still be one of the judges of Israel: because not only shall his offspring possess a share of the government and command, in the common polity, so that this tribe may constitute one head; but it shall be appointed the bearer of a standard to lead the fourth division of the camp of Israel. (210) In the second place, his subtle disposition is described. For Jacob compares this people to serpents, who rise out of their lurking-places, by stealth, against the unwary whom they wish to injure. The sense then is, that he shall not be so courageous as earnestly and boldly to engage in open conflict; but that he will fight with cunning, and will make use of snares. Yet, in the meantime, he shows that he will be superior to his enemies, whom he does not dare to approach with collected forces, just as serpents who, by their secret bite, cast down the horse and his rider. In this place also no judgment is expressly passed, whether this subtlety of Dan is to be deemed worthy of praise or of censure: but conjecture rather inclines us to place it among his faults, or at least his disadvantages, that instead of opposing himself in open conflict with his enemies, he will fight them only with secret frauds. (211)

“Dan shall be a serpent on the way,
A cerastes upon the track,
Biting the heels of the horse,
And his rider shall fall backwards.”

— Ed.