The apostle Paul taught that election is to service, and he did so very clearly.
1 Cor 1-
1 Paul, called to be an apostle of Christ Jesus by the will of God, and our brother Sosthenes,
2 To the church of God in Corinth, to those sanctified in Christ Jesus and called to be holy, together with all those everywhere who call on the name of our Lord Jesus Christ—their Lord and ours:
So here, Paul says he was "called" to be an apostle, and the Corinthian was "called" to be holy.
And, in Eph 1:4, he wrote that God chose US (believers, defined in v.19) to be holy and blameless.
And in Acts 9:15 the Lord Jesus told Ananias that Paul was:
But the Lord said to Ananias, “Go! This man is my chosen instrument to proclaim my name to the Gentiles and their kings and to the people of Israel.
So Paul viewed his election as a calling. And believers as chosen and called.
Further on in 1 Cor 1 Paul wrote this about calling and election:
26 Brothers and sisters, think of what you were when you were called. Not many of you were wise by human standards; not many were influential; not many were of noble birth.
27 But God chose the foolish things of the world to shame the wise; God chose the weak things of the world to shame the strong.
28 God chose the lowly things of this world and the despised things—and the things that are not—to nullify the things that are,
29 so that no one may boast before him.
And in all these verses, election is for service. So, believers are called (invited) and chosen (elected) to service for the Lord.
Now, where are the verses that say that salvation is by election? Nowhere. There are none.