Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:11779a –
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السيوطي:١١٧٧٩a –

"المُجاهِدُ مَنْ جَاهَد نَفْسَهُ في اللهِ" .  

[ت] الترمذي حسن غريب، [حب] ابن حبّان والعسكرى في الأمثال عن فُضالة بن عُبَيد

See similar narrations below:

Collected by Nasāʾī's Kubrá
nasai-kubra:11794 – Sūwayd b. Naṣr > ʿAbdullāh b. al-Mubārak > Ḥaywah b. Shurayḥ > Abū Hāniʾ al-Khawlānī > Abū ʿAlī al-Janbī > Faḍālah b. ʿUbayd

[Machine] "The Prophet ﷺ said, 'The true Mujahid (struggler) is the one who strives against his own self for the sake of Allah ﷻ.'"  

الكبرى للنسائي:١١٧٩٤ – عَنْ سُوَيْدِ بْنِ نَصْرٍ عَنْ عَبْدِ اللهِ بْنِ الْمُبَارَكِ عَنْ حَيْوَةَ بْنِ شُرَيْحٍ عَنْ أَبِي هَانِئٍ الْخَوْلَانِيِّ عَنْ أَبِي عَلِيٍّ الْجَنْبِيِّ عَنْ فَضَالَةَ بْنِ عُبَيْدٍ

عَنِ النَّبِيِّ ﷺ قَالَ «الْمُجَاهِدُ مِنْ جَاهَدَ نَفْسَهُ لِلَّهِ ﷻ»