The word ‘jihad’ is an Islamic term that cannot be applied to armed conflict against any other Muslim; this much is a firmly established principle. Furthermore, all scholars agree that jihad is conditional upon the consent of one’s parents. The proof for this is that a man came to the Prophet ﷺ asking him to permit him to perform jihad, upon which the Prophet ﷺ asked him: ‘Are your parents alive?’ to which he replied: ‘Yes.’ And the Prophet ﷺ told him: ‘Then perform jihad (struggle) through [serving] them. 15’
Moreover, there are two kinds of jihad in Islam: the greater jihad, which is the jihad (struggle) against one’s ego; and the lesser jihad, the jihad (struggle) against the enemy. In regards to the greater jihad, the Prophet ﷺ said: ‘We have returned from the greater jihad to the lesser jihad16.’ If you say that this Hadith is weak or apocryphal, the answer is that evidence for this concept is in the Qur’an itself: { So do not obey the disbelievers, but struggle against them therewith with a great endeavour [lit. a great jihad].} (Al-Furqan, 25:52). { Therewith’ in this verse refers to the Qur’an, which is { a healing for what is in the breasts} (Yunus, 10: 57).
This is clearly understood from the Hadith in which the Prophet ﷺ said: “‘Shall I tell you about the best of all deeds, the best act of piety in the eyes of your Lord which will elevate your status in the Hereafter and is better for you than spending gold and paper and better than going up in arms against your enemy and striking their necks and their striking your necks?’ They said: “Yes.” The Prophet ﷺ said: “Remembrance of God.17”’ Thus, the greater jihad is the jihad against the ego and its weapon is remembrance of God and purification of the soul. Furthermore, God has clarified the relationship between the two kinds of jihad in another verse: { O you who believe, when you meet a host, then stand firm and remember God much, that you may succeed.} (Al-Anfal, 8: 45).
13 The Prophet ﷺ did not kill the hypocrites who disagreed with him, nor did he permit that they be killed. Indeed the Prophet ﷺ said: ‘So that people do not say that Muhammad killed his companions.’ Narrated by Bukhari in Kitab Tafsir al-Qur’an, no. 4907, and by Muslim in Kitab al-Birr wal-Silah, no. 2584.
14 Narrated by Imam Ahmad in his Musnad, (Vol. 6, p. 306).
15 Narrated by Al-Bukhari in Kitab al-Jihad, no. 3004.
16 Narrated by Al-Bayhaqi in Kitab al-Zuhd, (Vol. 2, p. 165), and by Al-Khatib Al-Baghdadi in Tarikh Baghdad, (Vol. 3, p. 523).
17 Narrated by Imam Malik in Al-Muwatta’; Kitab al-Nida’ Lissalah, no. 490, also narrated by Al-Tirmidhi in Kitab al- Da’awat, and by Ibn Majah in Kitab al-Adab, no. 3790, and corrected by Al-Hakim in Al-Mustadrak (Vol. 1, p. 673).

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Read the full letter here: Open-Letter-To-Al-Baghdadi [pdf]
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