Abd al-Wahid bin Ziyad (may Allah have mercy on him) said: I said to Imam Zufar (may Allah have mercy on him): You have become a topic of talk and a laughingstock among the people. He asked: How so? I said: You say that the hadd is to be averted when there is doubt, yet you yourselves establish a very grave hadd despite doubt. He asked: How is that? I said: He (peace and blessings be upon him) said: "A believer will not be killed in return for a disbeliever," and you say that he will be killed. Imam Zufar (may Allah have mercy on him) said: I make you my witness that I have retracted it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنايات / 15922