Ibn Umar reported that Allah's Messenger (ﷺ) forbade Qaza. I said to Nafi
What is Qaza'? He said: This means having a part of a boy's head shaved and leaving a part unshaven.
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.
This hadith has been narrated on the authority of 'Umar b. Nafi' with the same chain of transmitters and Muhammad b. Muthanna as well as 'Umar b. Nafi have given the same exposition (of the word Qaza') in their narration.
This hadith has been narrated on the authority of Ibn 'Umar through another chain of transmitters.