Allah's Messenger (ﷺ) forbade Al-Qaza' (leaving a tuft of hair here and there after shaving one's head.)
Sahih al-Bukhari Book 77, Hadith 136
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that `Umar bin Nafi` told him that Nafi`, Maula `Abdullah had heard `Umar saying, "I heard Allah's Apostle forbidding Al-Qaza'." 'Ubaidullah added: I said, "What is Al-Qaza'?" 'Ubaidullah pointed (towards his head) to show us and added, "Nafi` said, 'It is when a boy has his head shaved leaving a tuft of hair here and a tuft of hair there." Ubaidullah pointed towards his forehead and the sides of his head. 'Ubaidullah was asked, "Does this apply to both girls and boys?" He said, "I don't know, but Nafi` said, 'The boy.'" 'Ubaidullah added, "I asked Nafi` again, and he said, 'As for leaving hair on the temples and the back part of the boy's head, there is no harm, but Al-Qaza' is to leave a tuft of hair on his forehead unshaved while there is no hair on the rest of his head, and also to leave hair on either side of his head.'"
Sahih al-Bukhari Book 77, Hadith 135 Next Hadith → I applied perfume to the Prophet (ﷺ) with my own hands when he wanted to assume the state of Ihram, and I also perfumed him at Mina before he departed from there (to perform Tawaf-al-Ifada).
Sahih al-Bukhari Book 77, Hadith 137
Sahih al-Bukhari Book 77, Hadith 135 Next Hadith → I applied perfume to the Prophet (ﷺ) with my own hands when he wanted to assume the state of Ihram, and I also perfumed him at Mina before he departed from there (to perform Tawaf-al-Ifada).
Sahih al-Bukhari Book 77, Hadith 137