From the hallmarks of a muslim is to feed the hungry, visiting the sick, freeing the captives

The Prophet ﷺ said, "Free the captives, feed the hungry and pay a visit to the sick."  

قَالَ رَسُولُ اللَّهِ ﷺ فُكُّوا الْعَانِيَ يَعْنِي الأَسِيرَ وَأَطْعِمُوا الْجَائِعَ وَعُودُوا الْمَرِيضَ  

I asked ʿAli, "Do you have the knowledge of any Divine Inspiration besides what is in Allah's Book?" ʿAli replied, "No, by Him Who splits the grain of corn and creates the soul. I don't think we have such knowledge, but we have the ability of understanding which Allah may endow a person with, so that he may understand the Qur'an, and we have what is written in this paper as well." I asked, "What is written in this paper?" He replied, "(The regulations of) blood-money, the freeing of captives, and the judgment that no Muslim should be killed for killing an infidel."  

قُلْتُ لِعَلِيٍّ ؓ هَلْ عِنْدَكُمْ شَىْءٌ مِنَ الْوَحْىِ إِلاَّ مَا فِي كِتَابِ اللَّهِ قَالَ وَالَّذِي فَلَقَ الْحَبَّةَ وَبَرَأَ النَّسَمَةَ مَا أَعْلَمُهُ إِلاَّ فَهْمًا يُعْطِيهِ اللَّهُ رَجُلاً فِي الْقُرْآنِ وَمَا فِي هَذِهِ الصَّحِيفَةِ قُلْتُ وَمَا فِي الصَّحِيفَةِ قَالَ الْعَقْلُ وَفَكَاكُ الأَسِيرِ وَأَنْ لاَ يُقْتَلَ مُسْلِمٌ بِكَافِرٍ