Romans 11:19
But you [Gentiles] will then say, "The branches were broken off so that we could be grafted in."
Romans 11:11-12
I say then, did the Jews trip [over Jesus] just so they could fall [away from God]? Certainly not! [There was another reason]: Instead, it was by means of their sin that salvation was made available to the Gentiles, so that the Jews might become jealous of them [i.e., causing them to want what the Gentiles now had].
Romans 11:17
But some of the branches [of a cultivated olive tree] were broken off [i.e., God's rejection of the Jews] and you [Gentiles], representing a wild olive tree [branch], were grafted into it. So then, you [Gentiles] were able to benefit from the roots and sap of the olive tree, along with the Jews.
Romans 11:23-24
And these Jews also will be grafted [back] in [to the olive tree] if they do not continue in their lack of faith [in Christ], because God is able to graft them back in again.