Romans 11:21-23

For if God spared not the natural branches, take heed lest he also spare not thee.

Behold therefore the goodness and severity of God: on them which fell, severity; but toward thee, goodness, if thou continue in his goodness: otherwise thou also shalt be cut off.

And they also, if they abide not still in unbelief, shall be graffed in: for God is able to graff them in again.