To us (hēmin). Both Jews and Gentiles, both classes in Paul’s audience, dative of advantage.
Is sent forth (exapestalē). Second aorist passive indicative of the double compound verb exapostellō, common verb to send out (exō) and forth (apo). It is a climacteric or culminative aorist tense. It has come to us in one day, this glorious promise.
The word of this salvation (ho logos tēs sōtērias tautēs). The message of Jesus as Saviour (Act 13:23), long ago promised and now come to us as Saviour.