John Lightfoot on Luke 4:29

[That they might cast him down headlong.] By what authority, or by what legal process could those of Nazareth do this? There was, indeed, a court of judicature consisting of three men, because a synagogue was there; but it was not in the power of that court to decree any thing in capital matters. It may be asked, whether that license that was permitted the zealots extended thus far: "He that steals the consecrated dishes and curseth by a conjurer" (that is, curseth God in the name of an idol), "and goes in to a heathen woman (that is, openly, as Zimri, Num 25:6), the zealots slay him. And the priest that ministers in his uncleanness, his brethren the priests beat out his brains with clubs." But doth this license of the zealot belong to all persons upon all occasions? When Nathanael said, [John 1:46] "Can there any good thing come out of Nazareth?" he does not seem there to reflect so much upon the smallness and insignificancy of the town, as the looseness and depravity of its manners.