James recommended what they should tell the non-Jewish believers.

Acts 15:13-21

13 When Barnabas and Paul had finished speaking, James, the leader of the group of believers there in Jerusalem, spoke to all of them. He said, “Fellow believers, listen to me. 14 Simon Peter has told you how God previously blessed the non-Jews. God did that by choosing from among them a people who would belong to him [MTY]. 15 These words that God spoke, words that were written by one of the prophets {that one of the prophets wrote} long ago, agree with that:

16 Later on I will return and I will re-establish the kingdom [MET] that David ruled and that has been {that people have} destroyed. My doing that will be like rebuilding a house that has been {that people have} torn down. 17 I will do that in order that all other people might seek me, the Lord God. I will do that in order that all the non-Jews whom I have called to belong to me [MTY] might seek me. You can be certain that this will happen because I the Lord God, who will do those things, have spoken these words. 18 I caused my people to know about them long ago.”

19 James continued by saying, “Therefore I have decided that we(inc) should stop bothering the non-Jewish people who are turning away from their sins and turning to God. That is, we should stop demanding that they obey all our laws and rituals. 20 Instead, we should write a letter to them requiring only four things: They should not eat meat/food that people have offered to idols, they should not have sex with someone to whom they are not married, they should not eat meat from animals that have been killed by being strangled {people have strangled}, and they should not eat the blood of animals. 21 In many cities, for a very long time people have been proclaiming the laws that Moses wrote [MTY], laws prohibiting those things. And every ◄Sabbath/Jewish day of rest► those laws are read {someone reads those laws} in the Jewish meeting places. So if the non-Jews want to know more about those laws, they can find out in our meeting houses.”