Talmai — Addition E 15: The Persians are to keep this day as a festival of salvation.
Licence: English and apparatus CC BY 4.0 (Talmai, Wroot Press); Greek from Swete, CC BY-SA. https://talmai.wrootpress.com/rights/
Canonical: https://talmai.wrootpress.com/unit/esth-plus-08.12-15/
Source edition: H. B. Swete, The Old Testament in Greek, 19.8.1a-24a

GREEK: καὶ ὑμεῖς οὖν ἐν ταῖς ἐπωνύμοις ὑμῶν ἑορταῖς ἐπίσημον ἡμέραν μετὰ πάσης εὐωχίας ἄγετε, ὅπως καὶ νῦν καὶ μετὰ ταῦτα σωτηρία ἡμῖν καὶ τοῖς εὐνοοῦσιν Πέρσαις, τοῖς δὲ ἡμῖν ἐπιβουλεύουσιν μνημόσυνον τῆς ἀπωλείας.
ENGLISH (draft-awaiting-approval): You also, therefore, among your own named festivals, keep this as a notable day with all festivity, so that both now and hereafter it may be salvation for us and for the Persians who are well disposed, but a reminder of destruction for those who plot against us.

PARALLELS:
- [Verbatim] Tosefet le-Esther, צו המלך השני (Tosefet le-Esther (he.wikisource editorial page: Additions to Esther in Hebrew)) — conduit: medieval retranslation. 'זה היום תשימו במועדיכם... לבעבור אשר יהי נכרים לפני עובדי פרסיים' renders Addition E's distinctive clause that the Persians too keep the day as festival, a detail absent from MT's Jews-only Purim.
- [Motif] Rashi on Megillah 14a:9:3 (Rashi on Bavli Megillah 9a-17a) — conduit: oral. 'The other lands too became fit to sing over the miracle' extends festival observance beyond Judea, matching Addition E's order that the Persians keep the day.
- [Motif] Targum Sheni on Esther 8:17:1 (Targum Sheni on Esther) — conduit: Aramaic. The day is kept as feasting and a good day in every province, with many gentiles becoming Jews -- the specific gentile-participation detail matching Addition E's summons to the Persians well disposed toward them.
- [Motif] Megillah 10b:23 (Bavli Megillah 9a-17a) — conduit: oral. The same 'everlasting sign... days of Purim' establishment of a perpetual festival matches the plus's instruction to keep this day 'among your own named festivals... now and hereafter.'