פירוש על שמואל א 13:14

But now, your kingship shall not endure. Because Moshe said so in the Torah, "[and] he does not stray from the commandment right or left, so that days of his reign are lengthy…."¹⁰ Devarim 17:20. Hence, if he does stray, the days [of his reign] will not be lengthy. And if you will argue that this was not said in reference to a Prophet's commandment, but only in reference to a commandment of the Torah, [I will answer that] it was already stated, "[and] to guard every word of this Torah" and afterwards, "that his pride not increase… and he turn not stray from the commandment"¹¹Devarim 18:19. And now that you failed to obey the commandment of ‘ה to obey His word as delivered by His prophets, you will be held accountable for your actions. [to include] even a prophet's commandment.