ἀλλ᾽. "Nay, then" — opening the imprecation, as
. σφιν, not “σφι”, was prob. always the form used by Attic tragedy. It is required by metre below, 444, 451, 1490: Ai. 570: El. 1070: Aesch. PV 252, 457: Pers. 759, 807: fr. 157 (ap. Plat. Rep. 391E). Eur. has the dat. in two places where, as here, “σφι” is possible, but in both “σφιν” has MS. authority, and should probably be read, Med. 398 (v.l. “σφι”), Suppl. 769. On the other hand there is no place in trag. where metre excludes “σφιν”. τὴν πεπρωμένην, by the curse in the house of Laïus (369).