Genesis 49:17

“Dan shall be a serpent by the way, an adder in the path, etc.] Or be like that sort of serpents called the adder; or rather, that which has the name of Cerastes, which lies among sand, and being of the same colour is not easily discerned, and is often trampled upon unawares, and bites at once, unexpected; as Bothart f1898 from various writers has shown; particularly Diodorus Siculus f1899 says, of this kind of serpents, that their bites are deadly, and being of the same colour with the sand, few discern them, so that many ignorantly treading on them fall into danger unawares; and so Onkelos paraphrases it, that lies in wait by the way; and is by another writer f1900 interpreted, a very…”

“DAN--though the son of a secondary wife, was to be "as one of the tribes of Israel." (Gen 49:16-18) Dan--"a judge." a serpent . . . an adder--A serpent, an adder, implies subtlety and stratagem; such was pre-eminently the character of Samson, the most illustrious of its judges.”

“- Jacob Blesses His Sons 5. מכרה mekêrāh, “weapon;” related: כיר kārar or כרה kārāh dig. “Device, design?” related: מכר mākar “sell,” in Arabic “take counsel. Habitation.” 10. מחקק mechoqēq, “lawgiver, judge, dispenser of laws.” This word occurs in six other places - Numbers 21:18; Deuteronomy 33:21; Jud. Deuteronomy 5:14; Psalms 60:9; Psalms 108:9; Isaiah 33:22; in five of which it clearly denotes ruler, or judge. The meaning “sceptre” is therefore doubtful. שׁילה shı̂ylôh, Shiloh, a softened form of שׁילון shı̂ylôn, a derivative of שׁל shol, the ultimate root of שׁלה shālâh, שׁלם shālam, and possibly שׁלט shālaṭ, and hence, denoting “the peacemaker, the prince of peace.” It…”