 Abdullah Ibn Umar mentioned a hadith that there are 11 some say 17 white hairs on the entire head of the Prophet Muhammad ﷺ and they are concentrated at the temples and he said Haadi he min Hud wa Akharatuhah. This is from the surat Hud and its sisters meaning the few suras after it. Why does he mention this? Why is this important? Why do we have to know the number of white hairs on the head of the Prophet ﷺ? Why did the Sahaba mention it? They mention it because they loved him. They loved him and when you love someone you want to know everything about that person. Don't you? You just don't want to know what that person said but how did they say it? What did they look like? How did they walk? How did they talk? How did they eat? This is why the Sahaba mention these things because they are annihilated and the love of the Prophet ﷺ and this love is for Feeh Sabirillah. This is for the sake of Allah SWT.