Abu Habibah said: I came to Sayyiduna Ali (may Allah be pleased with him) and said: I have committed zina, so carry out the hadd on me. He turned me away four times, then said: O Qanbar! Give him the hadd of a hundred lashes. I said: I am a slave. He said: Flog him, and when I say so, stop. Then he gave him fifty lashes.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحدود / 17092