On the authority of Ibn ‘Umar (may Allah be pleased with him) who said, “The Messenger of Allah (ﷺ) forbade qaza’. Qaza’ means having part of a boy’s head shaved and leaving part unshaven.

This Hadeeth clearly states the prohibition of Qaza’ which is to shave parts of the head and leave the others. Qaza‘ (stray of hair) means to shave a part of one’s head and to leave another. Meanwhile, if one has his hair cut in such a manner that there is a very clear difference between one part of one’s head and another, then this is also Qaza‘.

Allah Almighty knows best.