III Maccabees 7:15

15 slaying thus, in that day, above three hundred men, and esteeming this destruction of the wicked a season of joy.

III Maccabees 7:15 In-Context

13 Their priests, then, as it was meet, saluted him with good wishes, and all the people echoed with the Hallelujah. They then joyfully departed.
14 Then they punished and destroyed with ignominy every polluted Jew that fell in their way;
15 slaying thus, in that day, above three hundred men, and esteeming this destruction of the wicked a season of joy.
16 They themselves having held fast their God unto death, and having enjoyed a full deliverance, departed from the city garlanded with sweet-flowered wreaths of every kind. Uttering exclamations of joy, with songs of praise, and melodious hymns they thanked the God of their fathers, the eternal Saviour of Israel.
17 Having arrived at Ptolemais, called from the specialty of that district Rose-bearing, where the fleet, in accordance with the general wish, waited for them seven days,

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