Ibn Asakir reported: Abu al-Hasan al-Bushanji, may Allah have mercy on him, was asked about chivalry and he said, “Chivalry is with you in a verse from the Book of Allah and a report from the Prophet, peace and blessings be upon him. As for the saying of Allah, it is: They love those who emigrated to them and do not find any want in their hearts for what they were given, for they prefer them over their own selves, even though they were in deprivation, (59:9). As for the report of the Prophet, it is: No servant has faith until he loves for his brother what he loves for himself. It means to love what is good for him, and to hate for his brother what he hates for himself. Whoever combines these two traits has chivalry.”
Source: Tārīkh Dimashq 42964
عن ابن عساكر عن أبو الحسن علي بن أحمد البوشنجي رحمه الله أَنَّهُ سُئِلَ عَنِ الْفُتُوَّة فَقَالَ الْفُتُوَّة عِنْدَكَ فِي آيَةٍ مِنْ كِتَابِ اللَّهِ وَخَبَرٍ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، فَأَمَّا قَوْلُ اللَّهِ تَعَالَى يُحِبُّونَ مَنْ هَاجَرَ إِلَيْهِمْ وَلا يَجِدُونَ فِي صُدُورِهِمْ حَاجَةً مِمَّا أُوتُوا وَيُؤْثِرُونَ عَلَى أَنْفُسِهِمْ وَلَوْ كَانَ بِهِمْ خَصَاصَةٌ وَخَبَرُ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لا يُؤْمِنُ الْعَبْدُ حَتَّى يُحِبَّ لأَخِيهِ مَا يُحِبُّ لِنَفْسِهِ يَعْنِي مِنْ خَيْرٍ وَيَكْرَهَ لأَخِيهِ مَا يَكْرَهُ لِنَفْسِهِ فَمَنِ اجْتَمَعَ فِيهِ هَاتَانِ الْحَالَتَانِ فَلَهُ الْفُتُوَّة
42964 تاريخ دمشق لابن عساكر