ByShaykh Muhammad bin Salih Al-Uthaymeen
عائشة رضي الله عنها قالت قال رسول الله صلى الله عليه وسلم لا هجرة بعد
الفتح ولكن جهاد ونية وإذا استنفرتم فانفروا متفق عليه ومعناه: لا هجرة من
مكة لأنها صارت دار إسلام
From 'A'ishah, he said: Messenger of Allah sallallaahu' alaihi wa
sallam said: There is no emigration after the conquest of Mecca, but
Jihad and intentions, and if you are asked to go for jihad then go" 
Meaning: There is no emigration from Mecca because he has become the land of Islam. 
Legal issues that jihad fard 'ain is a major problem that has not been known by the Muslims. Berfatwa
so many preachers and called the legal jihad (perceived) fard 'ayn for
every individual, no basic rules are clear, and sometimes made in order
to realize personal desires and the particular group of people. Therefore
in this opportunity, we feel the need to include a brief explanation
about it from one of the scholars who have been known to science and
kesholehannya, so we all can do good on the science, and hopefully
taufiq God gave Him to us to walk in a straight path.
this hadith the Prophet sallallaahu 'alaihi wa sallam said there was no
emigration after the conquest of Mecca with his saying:
There is no emigration.
is not for the generality, meaning emigration was not canceled with the
conquests of Mecca, because the move will not be lost until the Day of
Resurrection as already exist in the hadeeth of the Prophet sallallaahu
'alaihi wa sallam.
لا تنقطع الهجرة حتى تنقطع التوبة ولا تنقطع التوبة حتى تطلع الشمس من مغربها
means: Hijrah uninterrupted until repentance is lost, and repentance is
not interrupted until the sun rises from the west" 
there is a move here is the absence of emigration from Mecca, as stated
by the author (Imam Nawawi) above, because after the conquest of Mecca a
Muslim country and after that it will again be a heathen country, with
this basis that the Prophet sallallaahu ' alaihi wa sallam abolish emigration after the conquest of Mecca.
formerly under the power of the Pagans, they had expelled the Prophet
sallallaahu 'alaihi wa sallam from him, then he sallallaahu' alaihi wa
sallam emigrated to Madinah with the permission of his Lord. After
eight years of the Prophet sallallaahu 'alaihi wa sallam in Medina, he
returned to Mecca and defeated him to become the land of Mecca and the
Islamic faith, and thus no longer move from there.
this hadith there is the argument that shows that Mecca would not
return to infidel country, but it remains a land of Islam till the Day
of Judgment comes, or until the time that Allah Subhanahu wa Ta'ala
Then the words of his: ولكن جهاد ونية "But the jihad and intention"
Significant: after this command is jihad, which is out of Makkah in Makkah for jihad. And
"waniyyatun" means: a good intention to strive in the path of Allah,
the jihad way is intended to enhance the sentence of God.
Then he said :: وإذا استنفرتم فانفروا "And if you are asked to go for jihad then go".
If waliyul amri (government) asks you to go for jihad in Allah's way,
then you must go for jihad, and jihad at the time the law is fard 'ayn. Then do not meet anyone, except those who have received udzur Allaah on the grounds of his word.
الذين ءامنوا مالكم إذا قيل لكم انفروا في سبيل الله اثاقلتم إلى الأرض
أرضيتم بالحياة الدنيا من الأخرة فما متاع الحياة الدنيا في الأخرة إلا
قليل إلا تنفروا يعذبكم عذابا أليما ويستبدل قوما غيركم ولاتضروه شيئا
والله على كل شىء قدير
O ye who believe, is why when it is said unto you: 'Depart (for
fighting) in Allah' ye cling heavily to the earth. Are you satisfied
with life in the world in exchange for life in the hereafter? When enjoyment
of life in the world (as opposed to life) in the Hereafter. If ye go
forth, Allah will punish with a grievous penalty, and the replacement of
(you) with another people, and you will not be able to give him the
slightest harm . Allah hath power over all things "[At-Tawbah: 38-39]
This is one of the state of jihad is fard a'in diuhukumi.
second situation: If the enemy surrounded the State, meaning the enemy
came to attack the country and besieged it, then the jihad at a time
when it becomes fard 'ayn. In these circumstances every man must fight, including women and elderly people are able to jihad. Since
this is a defensive jihad (jihad difa ') and a defensive war is
different from attacking MUSHs war (jihad tholab), resulting in a
situation like this all the people set out to defend their country.
third situation: If there is fighting, the two warring sides facing
each other, the rows of the infidels the ranks of the Muslims, the jihad
at the time the ruling fard 'ain and one should not turn away, as the
word of God.
ياأيها الذين ءامنوا إذالقيتم الذين كفروا زحفا فلا تولوهم الأدبار. ومن يولهم يومئذ دبره إلا متحرفا لقتال أو متحيزا إلى فئة فقد بآء بغضب من الله ومأواه جهنم وبئس المصير
O ye who believe, when ye meet those who disbelieve are attacking you,
then do not back to them (back). Person who turned them (back) at the
time, except for the turn (maneuver) or going to war merged
with other forces, then surely the man returned with wrath from Allah,
and his place is hell. And so have his home Evil "[Al-Anfal: 15-16]
Thus the Prophet sallallaahu 'alaihi wa sallam classify escaped from the battle field, including the seven major sins. 
fourth situation: If one takes, for example: no one knows except the
weapon use only one person, and people need that person to use the new
weapons, then it is obligatory upon it to strive even priests (waliyul
amri) did not ask him to leave and that obligation there because he needed.
Then in the fourth state of jihad is a fard 'ain, and that in others is fard kifaya.
Ahl stated that mandatory upon the Muslims to make the most of their
jihad once every year , jihad fighting the enemies of Allah in order
to exalt the word of Allah, not just defending the State. For defending the country, solely as a country, it can do the believers and unbelievers. Infidels-even defend their country. However,
a Muslim just to defend the religion of Allah, so he was defending his
country not because just as one country but because he is a Muslim
country, and he defended in order to preserve Islam. It
is therefore obligatory upon us to state that we are facing today, to
remind all people that call to liberate the country and is similar to it
is a call that does not fit, and mandatory for us to educate people
with religious education. And
be said: We are defending our religion before the others, because our
country is the state religion and Islamic countries in need of
protection and defense, then we must defend it with intention.
for defending the intent of nationalism or ethnicity then this happens
to believers and unbelievers, and the act was of no benefit to the
perpetrators on the day of Judgment, if killed in a state with the
intention to defend this country so he did not die a martyr; because the
Prophet sallallaahu 'alaihi wa sallam asked about
someone who is fighting for pride (pride) and fight for his courage and
fighting just because I wanted to show his prowess, which is said to be
the name of Allah, then he would say.
من قاتل لتكون كلمة الله هي العليا فهو في سبيل الله
"Meaning: Who is fighting for the sentence of God to be high, it was he who was in the way of Allah" 
Note this requirement! If
you fight for the country, then you and the unbelievers together, but
the fight because they want to enforce the sentence of God is held in
your country because your country is an Islamic state, then in these
circumstances that the war may be said the war in the way of Allah.
Have authentic from the Prophet sallallaahu 'alaihi wa sallam, that he said.
ما من مكلوم يكلم في سبيل الله والله أعلم بمن يكلم في سبيل الله إلا جاء يوم القيامة وجرحه يثعب دما اللون لون دم والريح ريح مسك
means: No injuries were injured in the way of God and God is to know
who was hurt in the way of Allah unless it comes to judgment in the
state of the wound to bleed, color is the color of blood but the scent
fragrance Misk (kasturi oil)" 
how the Prophet sallallaahu 'alaihi wa sallam requires martyrdom by
fighting only in Allah, then it is obligatory upon the claimant to
explain the science of this issue to the people.
And Allaah is the Source of strength