This salvation (τουτο το σωτηριον). Adjective from σωτηρ (Saviour), saving, bringing salvation. Common in the old Greek. The neuter as here often in LXX (as Psalm 67:2) as substantive like σωτηρια (cf. Luke 3:6).

They will also hear (αυτο κα ακουσοντα). Αυτο as opposed to the rejection by the Jews, "vivid and antithetical" (Page).