Musannaf Ibn Abi Shayba 24:144

Khalaf ibn Khalifah narrated to us, from his father, who said: My father informed me that when al-Hajjaj killed Ibn al-Zubayr, he brought him to Mina and crucified him at the mountain pass in the bottom of the valley. Then he said to the people, "Look at this, the worst of the nation." He said: I saw Ibn Umar come on a mule of his, and he went to bring it near the trunk, but it began to shy away. He said to his servant, "Woe to you, take its bridle and bring it near." He said: So I saw him bring it near, and Abdullah ibn Umar stood there saying, "May Allah have mercy on you, for you were one who fasted much and prayed much. And a nation of which you are the worst has indeed succeeded."