For rebellion is as the sin of witchcraft, and stubbornness is as idolatry and teraphim. Because you have rejected the word of Yahweh, he has also rejected you from being king.
"When God issues a decree that is plainly intended as irrevocable, as in the rejection of Saul, then, says our text, there is no possibility of that decree being rescinded (cf. Numbers 23:19)." [Note: Gordon, p. 146.] 