Because it is like the sin of witchcraft, to rebel: and like the crime of idolatry, to refuse to obey. Forasmuch therefore as thou hast rejected the word of the Lord, the Lord hath also rejected thee from being king.
His empire shall be multiplied, and there shall be no end of peace. He shall sit upon the throne of David, and upon his kingdom: to establish it and strengthen it with judgment and with justice, from henceforth and for ever. The zeal of the Lord of hosts will perform this.
I will be to him a father: and he shall be to me a son. And if he commit any iniquity, I will correct him with the rod of men, and with the stripes of the children of men.
And he stripped himself also of his garments, and prophesied with the rest before Samuel, and lay down naked all that day and night. This gave occasion to a proverb: What! Is Saul too among the prophets?
And Samuel said to Saul: I will not return with thee, because thou hast rejected the word of the Lord, and the Lord hath rejected thee from being king over Israel.