Wait a second. You asked for one reference, and
@maxamir, after a false start, gave you that single reference, quoted as you asked. Please do him the courtesy of addressing his appropriate answer.
Acts 13:48, "Now when the Gentiles heard this, they were glad and glorified the word of the Lord.
And as many as had been appointed to eternal life believed."
Then Paul and Barnabas grew bold and said, “It was necessary that the word of God should be spoken to you first; but since you reject it, and judge yourselves unworthy of everlasting life, behold, we turn to the Gentiles. For so the Lord has commanded us:
I have set you as a light to the Gentiles,
That you should be for salvation to the ends of the earth.’ ”
Now when the Gentiles heard this, they were glad and glorified the word of the Lord. And as many as had been appointed to eternal life believed.
And the word of the Lord was being spread throughout all the region.
Acts 13:46-49
Paul and Barnabas were sent to that region with the Gospel message of Jesus Christ, to proclaim the way of salvation to them. Some rejected it, and some received it.
No one is ever saved apart from believing the Gospel, the word, the message of Jesus Christ.
If a group of people were “appointed” to receive eternal life, then obviously they don’t have eternal life yet. First they must hear the Gospel, and then believe it, in order to receive the intended eternal life.
God intends that the whole world should receive eternal life through His Son, however there must be those willing to go and preach the good news, like Paul and Barnabas did.
You would understand this if you read the context and not just lifting one verse out f context.
Now in the church that was at Antioch there were certain prophets and teachers: Barnabas, Simeon who was called Niger, Lucius of Cyrene, Manaen who had been brought up with Herod the tetrarch, and Saul. As they ministered to the Lord and fasted, the Holy Spirit said, “Now separate to Me Barnabas and Saul for the work to which I have called them.” Then, having fasted and prayed, and laid hands on them, they sent them away.
So, being sent out by the Holy Spirit, they went down to Seleucia, and from there they sailed to Cyprus. Acts 13:1-4
Calvinism teaches a person is first saved, (somehow without ever hearing and believing the Gospel; which is a Christ-less salvation) then they can believe the Gospel.
Obviously these people whom Paul and Barnabas were sent to heard the Gospel then they believed. Being appointed to eternal life means it is appointed for you to hear the Good News of Jesus Christ. Those who believe are saved, those who do n’t believe are damned.
And He said to them, “
Go into all the world and preach the gospel to every creature. He who believes and is baptized will be saved; but he who does not believe will be condemned. Mark 16:15-16
JLB