Abraham, Isaac, Jacob, and the nation of Israel was introduced to God and His Story through His Covenants. First through the Abrahamic covenant, then the Mosaic/Sinaitic covenant, then the Davidic covenant, and the promised New covenant.
Gentile obligations to Jews
Bless Israel / Jews
I will bless those who bless you, and him who dishonors you I will curse, and in you all the families of the earth shall be blessed.
Genesis 12:3
Biblical proof that Christian churches should support Messianic Jewish ministries
For if the Gentiles have shared in their spiritual blessings, they also ought to serve them in material blessings.
Romans 15:27
For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes, to the Jew first…
Only, they asked us to remember the poor, the very thing I was eager to do.
Galatians 2:10
Now concerning the collection for the saints: as I directed the churches of Galatia, so you also are to do. On the first day of every week, each of you is to put something aside and store it up, as he may prosper, so that there will be no collecting when I come. And when I arrive, I will send those whom you accredit by letter to carry your gift to Jerusalem. If it seems advisable that I should go also, they will accompany me.
1 Corinthians 16:1–4
We want you to know, brothers, about the grace of God that has been given among the churches of Macedonia, for in a severe test of affliction, their abundance of joy and their extreme poverty have overflowed in a wealth of generosity on their part. For they gave according to their means, as I can testify, and beyond their means, of their own accord, begging us earnestly for the favor of taking part in the relief of the saints.
2 Corinthians 8:1–4 (and the rest of chapters 8–9)
At present, however, I am going to Jerusalem bringing aid to the saints. For Macedonia and Achaia have been pleased to make some contribution for the poor among the saints at Jerusalem. For they were pleased to do it, and indeed they owe it to them. For if the Gentiles have come to share in their spiritual blessings, they ought also to be of service to them in material blessings.
Romans 15:25–27
Now after several years I came to bring alms to my nation and to present offerings.
Acts 24:17
Paul later tells the Roman governor Felix that he had come to Jerusalem with gifts for his people—the same collection.