So if he stones Jamarat al-Aqaba, he should shave his head, which is better than shortening his hair. Feeling a matter is not the same as attaining complete knowledge of it in detail. Rather, the servant feels that there is a matter, and when he attains it, the feeling disappears, and he has complete knowledge of the details of what he felt, just like someone who feels in detail in general. Before knowledge is acquired, its details are determined, so casting the feeling is removing the feeling of the presence of knowledge, because hair is a covering over the head .