I asked the Prophet, "What is the best deed?" He replied, "To believe in Allah and to fight for His Cause." I then asked, "What is the best kind of manumission (of slaves)?" He replied, "The manumission of the most expensive slave and the most beloved by his master." I said, "If I cannot afford to do that?" He said, "Help the weak or do good for a person who cannot work for himself." I said, "If I cannot do that?" He said, "Refrain from harming others for this will be regarded as a charitable deed for your own good." (Using translation from Bukhārī 2518)   

سَأَلْتُ رَسُولَ اللهِ ﷺ أِيُّ الْعَمَلِ أَفْضَلُ؟ قَالَ إِيمَانٌ بِاللهِ وَجِهَادٌ فِي سَبِيلِ اللهِ قُلْتُ أِيُّ الرِّقَابِ أَفْضَلُ؟ قَالَ أَغْلَاهَا ثَمَنًا وَأَنْفَسُهَا عِندَ أَهْلِهَا قَالَ قُلْتُ فَإِنْ لَمْ أَفْعَلْ؟ قَالَ تُعِينُ صَانِعًا أَوْ تَصْنَعُ لِأَخْرَقَ قَالَ قُلْتُ فَإِنْ لَمْ أَفْعَلْ؟ قَالَ تَدَعُ النَّاسَ مِنَ الشَّرِّ فَإِنَّهَا صَدَقَةٌ تَصَدَّقُ بِهَا عَلَى نَفْسِكَ