Musannaf Ibn Abi Shayba 3:3452

Hukaym al-Razi narrated to us, from Anbasa, from Ibn Abi Layla, from Abd al-Karim, from Mujahid: He said: He says the takbir with the Imam, then he says the takbir when he finishes. Abu Bakr said: And it has reached me that this is the opinion of Ibn Abi Layla.