Romans 9:6-8, "However, it is not as though Yahweh's plan had failed. For it is not everyone who is a descendant of Israyl who belongs to Israyl. Nor, just because they are his descendants, are they all Abraham's children; but: In Isaac will your seed be called. That is, it is not those who are the children of the flesh who are Yahweh's children; but it is the children of the promise who are regarded as Abraham's seed."
Galations 3:28,29, "Is there not the Yahdai as well as the Greek; Gentile? Is there not the slave as well as the freeman? Is there not the male and the female? For all of you must be in unity in Yahshua Messiah. And if you are in Messiah, then
you are a seed of Abraham, heirs according to the promise."
Goes WAYYY back
Exodus 12:48-49, "And when a stranger lives among you and wants to sacrifice the Passover to Yahweh, let all his males be circumcised, and then let him come near, and sacrifice it; and he shall be as a native of the land. But no euncircumcised person shall eat of it. One Law shall be for the nativeborn and for the stranger who dwells among you."
Numbers 15:15-16, "One ordinance shall be for you of the congregation, and for the stranger who sojourns with you, as an ordinance forever throughout your generations. As you are, so shall the stranger be in front of Yahweh. One Law and one manner shall be for you and for the stranger who sojourns with you."
Isayah 56:1-7, "This is what Yahweh says: Keep the judgments, and do justly; for My salvation is near, soon, to come, and My righteousness to be revealed. Blessed is the man who does this, and the son of man who lays hold on it; who keeps the Sabbaths without polluting; defiling, them; and keeps his hand from doing dany evil. Do not let the son of the Gentile, who has joined himself to Yahweh, speak, saying; Yahweh has utterly separated me from His people. Nor let the eunuch say; Behold, I am a dry tree. For this is what Yahweh says: To the eunuchs who keep My Sabbaths, and choose those things which eplease Me, and hold fast to My covenant: I will give to them, in My House, even within My walls, a place and a Name equal to that of sons and of daughters; I will give them the Name of The Everlasting: YAHWEH; which will not be cut off. Also the sons of the Gentile who join themselves to Yahweh, to serve Him, and to love the Name of Yahweh, to be His servants--everyone who keeps the Sabbaths without polluting; defiling, them and who holds fast to My covenant--I will bring them to My holy mountain, and make them joyful in My House of prayer..."