Musannaf Ibn Abi Shayba 3:2049

Waki’ narrated to us, from ‘Imran bin Hudayr, from Abu Mijlaz, who said: I threw the pebbles at the Jamarat, but I did not know how many I had thrown. So I asked Ibn ‘Umar, but he did not answer me. Then Ibn al-Hanafiyyah passed by, and I asked him. He said: "He should repeat [the stoning], O Abu ‘Abd Allah. There is nothing with us greater than the prayer, and if one of us forgets [in it], he repeats it." He said: So I mentioned his statement to Ibn ‘Umar, and he said: "They are a household that has been given understanding."