Musnad Ahmad 928:26

Abdullah narrated to us, Wahb ibn Baqiyyah narrated to me, Khalid ibn Abdullah al-Tahhan informed us, from Yazid ibn Abi Ziyad, from Zirr ibn Hubaysh, from Ubayy ibn Ka'b, who said: "How many [verses] do you recite Surah al-Ahzab?" He said: "Seventy-something verses." He said: "I have recited it with the Messenger of Allah, peace and blessings of Allah be upon him, [and it was] like [Surah] al-Baqarah, or more than it, and indeed, the verse of stoning is in it."