III Maccabees 6:38

38 They were being enrolled from the twenty-fifth of Pachon to the fourth of Epiphi, a period of forty days: the measures taken for their destruction lasted from the fifth of Epiphi till the seventh, that is, three days.

III Maccabees 6:38 In-Context

36 They made a public ordinance to commemorate these things for generations to come, as long as they should be sojourners. They thus established these days as days of mirth, not for the purpose of drinking or luxury, but because God had saved them.
37 They requested the king to send them back to their homes.
38 They were being enrolled from the twenty-fifth of Pachon to the fourth of Epiphi, a period of forty days: the measures taken for their destruction lasted from the fifth of Epiphi till the seventh, that is, three days.
39 The Ruler over all did during this time manifest forth his mercy gloriously, and did deliver them all together unharmed.
40 They feasted upon the king's provision up to the fourteenth day, and then asked to be sent away.

The Brenton translation of the Septuagint is in the public domain.