Romans 11:21-23

²¹for if God spared not the natural branches, neither will he spare thee.

²²Behold then the goodness and severity of God: toward them that fell, severity; but toward thee, God’s goodness, if thou continue in his goodness: otherwise thou also shalt be cut off.

²³And they also, if they continue not in their unbelief, shall be grafted in: for God is able to graft them in again.