Abu Musa al-Ash'ari reported God’s messenger as saying, “The faithful Muslim storekeeper who gives what he is commanded completely and in full with a good will, and delivers it to the one to whom he was told to give it, is one of the two* who give sadaqa.” (Bukhari and Muslim.) * The two are his master and himself.
Hadith Referenceمشكوة المصابيح / كتاب الزكاة / 1949
Hadith Gradingالألبانی:مُتَّفَقٌ عَلَيْهِ | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (1438) و مسلم (1023/79)»