'Cutoff' in the Bible

For I could wish that I myself were accursed -- cut off from Christ -- for the sake of my people, my fellow countrymen,

Notice therefore the kindness and harshness of God -- harshness toward those who have fallen, but God's kindness toward you, provided you continue in his kindness; otherwise you also will be cut off.

For if you were cut off from what is by nature a wild olive tree, and grafted, contrary to nature, into a cultivated olive tree, how much more will these natural branches be grafted back into their own olive tree?