It is narrated from Hasan al-Basri (may Allah have mercy on him) that a man performed a secret marriage. Someone accused him, saying, "You are committing adultery." The matter was brought to Sayyiduna Umar ibn al-Khattab (may Allah be pleased with him), so the man said, "She is my wife." Thus, Sayyiduna Umar (may Allah be pleased with him) did not carry out the hadd punishment on the accuser.