Parallel
Exodus 13:15
Rahlfs Septuagint (1935) · Berean Standard Bible
ἡνίκα δὲ ἐσκλήρυνεν Φαραω ἐξαποστεῖλαι ἡμᾶς ἀπέκτεινεν πᾶν πρωτότοκον ἐν γῇ Αἰγύπτῳ ἀπὸ πρωτοτόκων ἀνθρώπων ἕως πρωτοτόκων κτηνῶν διὰ τοῦτο ἐγὼ θύω τῷ κυρίῳ πᾶν διανοῖγον μήτραν τὰ ἀρσενικά καὶ πᾶν πρωτότοκον τῶν υἱῶν μου λυτρώσομαι
And when Pharaoh stubbornly refused to let us go, the LORD killed every firstborn in the land of Egypt, both of man and beast. This is why I sacrifice to the LORD the firstborn male of every womb, but I redeem all the firstborn of my sons.’