Romans 11:21

Spared not. This verse explains the reason why Gentile converts should feel awed. Notwithstanding their greater privilege, God did not spare the natural branches when they sinned. Much more reason is there for the wild grafts to fear that God will not spare them if they commit the same sin.

Take heed. Textual evidence may be cited (see p. 10) for the reading, “neither will he spare you,” instead of, “take heed lest he also spare not thee.”