Sayyiduna Anas bin Malik (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) sent for a slave and, after being cupped, told that he be given "one or two sa', or one or two mudd", and he also ordered that his tax be reduced.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19511