Sayyiduna Ali (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) got cupped and ordered me to pay the cupper his wage. Abdullah bin Damrah narrates from Sayyiduna Ali (may Allah be pleased with him): "The earnings of the cupper are unlawful."
The first report is sounder and more in keeping with what has preceded than the one narrated by Ata al-Khurasani from Abdullah bin Damrah from Ali.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19520