Sahih Bukhari Volume 3, Book 49, Hadith 2519

حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُوسَى، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ أَبِي مُرَاوِحٍ، عَنْ أَبِي ذَرٍّ ـ رضى الله عنه ـ قَالَ سَأَلْتُ النَّبِيَّ صلى الله عليه وسلم أَىُّ الْعَمَلِ أَفْضَلُ، قَالَ ‏"‏ إِيمَانٌ بِاللَّهِ، وَجِهَادٌ فِي سَبِيلِهِ ‏"‏‏.‏ قُلْتُ فَأَىُّ الرِّقَابِ أَفْضَلُ قَالَ ‏"‏ أَغْلاَهَا ثَمَنًا، وَأَنْفَسُهَا عِنْدَ أَهْلِهَا ‏"‏‏.‏ قُلْتُ فَإِنْ لَمْ أَفْعَلْ‏.‏ قَالَ ‏"‏ تُعِينُ صَانِعًا أَوْ تَصْنَعُ لأَخْرَقَ ‏"‏‏.‏ قَالَ فَإِنْ لَمْ أَفْعَلْ‏.‏ قَالَ ‏"‏ تَدَعُ النَّاسَ مِنَ الشَّرِّ، فَإِنَّهَا صَدَقَةٌ تَصَدَّقُ بِهَا عَلَى نَفْسِكَ ‏"‏‏.‏

Narrated By Abu Dhar : 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."