I Samuel 16:8 Jewish Thought: Netivot Olam

And in the chapter of ‘These are the Words’ (Pesachim 66b): Rabbi Shimon ben Lakish said: any person that becomes angry: if he is a wise man, his wisdom departs from him; if he is a prophet, his prophecy departs from him. If he is a wise man his wisdom departs from him – as it is written (Numbers 31:14), “And Moses was wroth with the officers of the host”, and it says (Numbers 31:21) “And Eleazar the priest said…”, implying that it (the wisdom/laws) became hidden from Moses. If he is a prophet his prophecy departs from him – from Elisha, as it is written (II Kings 3:14): “…surely, were it not that I regard the presence of Jehoshapat the king of Judah, I would not look toward thee, nor see thee,” and it is written (II Kings 3:15): “But now bring me a minstrel.’ And it came to pass, when the minstrel played, that the spirit [hand] of the LORD came upon him.” Rabbi Mani the son of Patish said: any person who becomes angry, even if he is destined for greatness from the heavens is lowered. From where do we know this? From where do we know this? From Eliab, as it is written (I Samuel 17:28) “and Eliab’s anger was kindled against David and he said..,”, and when Shmuel went to anoint him with reference to all of [David’s brothers] it is written, (I Samuel 16:8) "