LXX Gen 34:25

ἐγένετο δὲ ἐν τῆ ἡμέρᾳ τῆ τρίτη ὅτε ἦσαν ἐν τῷ πόνῳ, ἔλαβον οἱ δύο υἱοὶ Ἰακὼβ Συμεὼν καὶ Λευί, ἀδελφοὶ Δεῖνας, ἕκαστος τὴν μάχαιραν αὐτοῦ, καὶ εἰσῆλθον εἰς τὴν πόλιν ἀσφαλῶς καὶ ἀπέκτειναν πᾶν

Three days later, while they were still in pain, two of Jacob’s sons (Dinah’s brothers Simeon and Levi) took their swords, went into the unsuspecting city, and slaughtered every male.