Abu Zubayr Makki reported,

A marriage case was brought before Umar bin Khattab in which only one man and one woman had witnessed it. He said, "This is a secret marriage, and I do not permit it. Had I already given a ruling forbidding it, I would have ordered stoning."

و حدثني عن مالك

عن أبي الزبير المكي

أن عمر بن الخطاب أتي بنكاح لم يشهد عليه إلا رجل وامرأة فقال هذا نكاح السر ولا أجيزه ولو كنت تقدمت فيه لرجمت