It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: The best charity is a milking goat which becomes a source of reward morning and evening. The charity of a milking she-camel is like freeing a red-skinned slave, and the charity of a milking goat is like freeing a black-skinned slave.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 8701
Hadith Gradingحکم دارالسلام:إسناده ضعيف، عبيدالله فى عداد المجهولين، ومحمد بن عبدالله مثله ، وفليح ليس بذاك ، وهذا الحديث تفرد به الإمام أحمد