alkathiri
As-Shafaa'i(Brother)
Scholars of Shafi madhhab say that it's makruh without imams permission and it's about the aggressive type of jihad, not when muslims are attacked.
Imam Nawawi said:
يكره غزو بغير إذن الإمام أو نائبه
"Fighting without permission from Imam and his deputy is makruh!"
"Minhaj at-Talibin", Kitab as-Siyar, pg: 519
And great scholar of Shafi madhhab Khatib al-Shirbini in his commentary on Imam Nawawi's "Minhaj at-Talibin" said about these words:
( يكره غزو بغير إذن الإمام أو نائبه )
تأدبا معه ، ولأنه أعرف من غيره بمصالح الجهاد ، وإنما لم يحرم ؛ لأنه ليس فيه أكثر من التغرير بالنفوس وهو جائز في الجهاد .
وينبغي كما قال : الأذرعي تخصيص ذلك بالمتطوعة أما المرتزقة فلا يجوز لهم ذلك ؛ لأنهم مرصدون لمهمات تعرض للإسلام يصرفهم فيها الإمام ، فهم بمنزلة الأجراء .
تنبيه : استثنى البلقيني من الكراهة صورا .
إحداها : أن يفوته المقصود بذهابه للاستئذان .
ثانيها : إذا عطل الإمام الغزو وأقبل هو وجنوده على أمور الدنيا كما يشاهد .
ثالثها : إذا غلب على ظنه أنه لو استأذنه لم يأذن له .
"Fighting without permission from Imam and his deputy is makruh!"
Because his status should be respected and because he is more knowledgable than others in matters of jihad. But it's not haram (to fight without his permission), because there is nothing more than exposing yourself to danger and it's permissable in Jihad.
It should be - as al-Adhrai' said - limited only for volunteers. As for a professional army (those who are payed for their service) it's not allowed for them, because they are allocated in the strategic places around the country to defend Islam and Imam is in charge of them and they are like hired workers.
NOTICE: al-Balqini exempted following cases from "karaha":
First: If seeking permission would delay it so that the benefit of fighting would be lost.
Second: If the Imam neglects jihad and he and his soldiers are attached to this world. As we observe it happening today.
Third: If they have well-grounded suspicion that if the permission is sought it would not be granted."
"Mughni al-Muhtaj", 4/220
Another shafi'i scholar Ahmad bin Ibrahim bin Muhammad Abu Zakariyya ad-Dimashqi, known as Ibn Nuhhas said in his famous book on this subject:
الجهد بغير إذن الإمام أو نائبه مكروه و لكنه ليس حراما
"Jihad without permission from Imam or his deputy is makruh, but not haram."
"Mashari al-Ashwaq ila Masari al-Ushaq", 315
Imam Nawawi said:
يكره غزو بغير إذن الإمام أو نائبه
"Fighting without permission from Imam and his deputy is makruh!"
"Minhaj at-Talibin", Kitab as-Siyar, pg: 519
And great scholar of Shafi madhhab Khatib al-Shirbini in his commentary on Imam Nawawi's "Minhaj at-Talibin" said about these words:
( يكره غزو بغير إذن الإمام أو نائبه )
تأدبا معه ، ولأنه أعرف من غيره بمصالح الجهاد ، وإنما لم يحرم ؛ لأنه ليس فيه أكثر من التغرير بالنفوس وهو جائز في الجهاد .
وينبغي كما قال : الأذرعي تخصيص ذلك بالمتطوعة أما المرتزقة فلا يجوز لهم ذلك ؛ لأنهم مرصدون لمهمات تعرض للإسلام يصرفهم فيها الإمام ، فهم بمنزلة الأجراء .
تنبيه : استثنى البلقيني من الكراهة صورا .
إحداها : أن يفوته المقصود بذهابه للاستئذان .
ثانيها : إذا عطل الإمام الغزو وأقبل هو وجنوده على أمور الدنيا كما يشاهد .
ثالثها : إذا غلب على ظنه أنه لو استأذنه لم يأذن له .
"Fighting without permission from Imam and his deputy is makruh!"
Because his status should be respected and because he is more knowledgable than others in matters of jihad. But it's not haram (to fight without his permission), because there is nothing more than exposing yourself to danger and it's permissable in Jihad.
It should be - as al-Adhrai' said - limited only for volunteers. As for a professional army (those who are payed for their service) it's not allowed for them, because they are allocated in the strategic places around the country to defend Islam and Imam is in charge of them and they are like hired workers.
NOTICE: al-Balqini exempted following cases from "karaha":
First: If seeking permission would delay it so that the benefit of fighting would be lost.
Second: If the Imam neglects jihad and he and his soldiers are attached to this world. As we observe it happening today.
Third: If they have well-grounded suspicion that if the permission is sought it would not be granted."
"Mughni al-Muhtaj", 4/220
Another shafi'i scholar Ahmad bin Ibrahim bin Muhammad Abu Zakariyya ad-Dimashqi, known as Ibn Nuhhas said in his famous book on this subject:
الجهد بغير إذن الإمام أو نائبه مكروه و لكنه ليس حراما
"Jihad without permission from Imam or his deputy is makruh, but not haram."
"Mashari al-Ashwaq ila Masari al-Ushaq", 315