פירוש על שמואל א 16:7

Do not look at his appearance. Upon the beauty of his stature.

For I have rejected him. Because he is a quick tempered person, as it is stated, 'And Eliov became angry with Dovid.'⁴ Below 17:28. Also, see Maseches Pesachim 66b, that Eliov actually possessed the qualities of a king but ‘ה rejected him because he had a bad temper.

For it is not as man perceives it. Even though you called yourself a seer, when you said to Shaul, 'I am the seer,'⁵Above 9:19. ה׳ punished Shmuel for inferring albeit an infinitesimal of pride by saying “I am the seer.” Moshe was similarly punished for saying “the matter that will be too difficult for you, present to me and I will hear it.” [Devarim 1:17]—Sifre, Devarim 1:17 here I am informing you that you do not see.