What is Qaza'? He said: This means having a part of a boy's head shaved and leaving a part unshaven.
Sahih Muslim Book 37, Hadith 169
← Previous Hadith I saw in the hand of Allah's Messenger (ﷺ) an instrument for cauterisation and he was cauterising the caracia collected as Zakat.

Sahih Muslim Book 37, Hadith 168 Next Hadith → This hadith has been reported on the authority of 'Ubaidullah with the same chain of transmitters. and the exposition of Qaza' is the same as that of Abu Usama.

Sahih Muslim Book 37, Hadith 170