Joel 3:4

And also what are ye to me? i.e., apparently, what would ye do to me?the following words, will ye repay&c. explaining in what sense the question is meant.

all the districts of Philistia] lit. circles, i.e. (probably) the districts ruled by the five -lords" of the Philistines: see Josué 13:2 f., where the same expression also occurs (A.V. "borders," R.V. "regions"; Heb. gelîlôth), and comp. 1Ma 5:15, where πᾶσα Γαλιλαία ἀλλοφύλων ("all Galilee [48] of the foreigners") must, it seems, represent the same Hebrew original (ἀλλόφυλοι standing often in LXX. for Philistines).

[48] "Galilee" is properly "the gâlîl(or -circle")", Josué 20:7; in full, "the gâlîl(or -circle") of the nations" (Is. 8:23).

will ye repay a deed of mine, or will ye do aught unto me?(R.V. marg.)] i.e. is there any injustice that I have done to you (through Israel) which you would avenge, or would you even assail me gratuitously? The question is a rhetorical one, to which of course a negative answer is expected: their treatment of Israel has been unprovoked; it is they, and not Israel, who merit vengeance; accordingly the retort follows, Swiftly and speedily will I return your deed (R.V. marg.) upon your own head.

upon your head for the phrase, comp. Abdías 1:15 (where -reward" is properly doing, or deed, as here); also Jueces 9:57; 1 Samuel 25:39, &c.