Ruling on shortening the sides of the hair more than the middle

The one who cuts his hair should make it all the same length.
The one who cuts his hair on the sides of his head more than the middle
comes under the heading of qaza’, which is forbidden. Al-Bukhaari (5921) and
Muslim (2120) narrated from Ibn ‘Umar that the Messenger of Allaah
(blessings and peace of Allaah be upon him) forbade qaza’. Naafi’ (one of
the narrators of the hadeeth) said, explaining qaza’: Shaving part of a
boy’s head and leaving part. 

Al-Nasaa’i (5048) and Abu Dawood (4195) narrated from Ibn
‘Umar that the Prophet (blessings and peace of Allaah be upon him) saw a boy
part of whose head had been shaved and part of it left. He told them not to
do that and said: “Shave all of it or leave all of it.” Al-Albaani classed
it as saheeh in Saheeh al-Nasaa’i. 

That includes cutting some of the hair short and leaving
some. 

It says in Fataawa al-Lajnah al-Daa’imah (5/175):

What is the ruling on leaving some of the hair longer than
the rest?

Answer: Abu Dawood narrated from ‘Abd-Allaah ibn ‘Umar (may
Allaah be pleased with him) that the Messenger of Allaah (blessings and
peace of Allaah be upon him) forbade qaza’ and said: “Shave all of it or
leave all of it.” 

it says in Sharh al-Iqnaa’: Qaza’ includes shaving
some places on the sides of the head, or shaving the middle and leaving the
sides, as most of the Christians do, or shaving the sides and leaving the
middle, as many of the foolish do, or shaving the front and leaving the
back. Ahmad was asked about shaving the back of the head and he said: This
is the action of the Magians, and whoever imitates a people is one of them.
Thus it is known that it is not permissible to
leave some parts of the hair longer than others.

‘Abd-Allaah ibn Ghadyaan, ‘Abd al-Razzaaq ‘Afeefi, Ibraaheem
ibn Muhammad Aal al-Shaykh. End quote. 

Shaykh Ibn Jibreen (may Allaah preserve him) was asked: It
has become common among women and men to cut their hair in such a way that
there is an area that is 10 or 13 cm long, then they shave the hair on the
sides and back of the head completely, leaving only the hair on the top of
the head.  

What is the ruling on that and what is the evidence? Does
this come under the heading of qaza’ or not? Why? 

He replied: There is no doubt that this action is wrong and
is blind following of others, and it comes under the heading of qaza’. It
was narrated that the Prophet (blessings and peace of Allaah be upon him)
forbade qaza’; he saw a boy who had part of his head shaved and he said:
“Shave all of it or leave all of it.” Moreover, this style is not
beautification for either men or women, rather it is changing the creation
of Allaah and spoiling people’s appearance, and it is an imitation of the
West in which there is no benefit, in addition to the cost involved, as it
involves a lot of effort and spending money on something that is harmful, as
is well known. We advise men not to adopt this western style and we advise
women to stick with that which their mothers and grandmothers did, of
letting their hair grow and braiding it, as this is more beautiful. And
Allaah is the one whose help we seek; may Allaah send blessings and peace
upon Muhammad and his family and Companions. End quote from Fataawa
al-Shaykh Ibn Jibreen. 

Shaykh Muhammad al-Mukhtaar al-Shanqeeti (may Allaah preserve
him) said: The one who cut the hair on the sides of his head and makes the
hair thick in the middle of the head is included in this, because this is
imitating immoral people. Some of the scholars (may Allaah have mercy on
them) referred to that. We know that some of our earlier shaykhs were very
strict with regard to cutting some parts of the hair and not others, and
they regarded that as coming under the heading of qaza’ and they said:
Either cut all of it or shave all of it. This is the basic principle we
should follow, according to the scholars. The Sunnah with regard to hair is
to shave all of it or cut all of it, not to cut some of it and leave some of
it, because this is an imitation of corrupt people. End quote from Sharh
Zaad al-Mustaqni’. 

See also question number
12701 and
10516. 

And Allaah knows best.