Romans 11:16-19

11:16 For if the firstfruit [be] holy, the lump [is] also [holy]: and if the root [be] holy, so [are] the branches. 11:17 And if some of the branches be broken off, and thou, being a wild olive tree, wert graffed in among them, and with them partakest of the root and fatness of the olive tree; 11:18 Boast not against the branches. But if thou boast, thou bearest not the root, but the root thee. 11:19 Thou wilt say then, The branches were broken off, that I might be graffed in.

Romans 11:21

11:21 For if God spared not the natural branches, [take heed] lest he also spare not thee.