Musannaf Ibn Abi Shayba 3:768

Abu Bakr narrated to us, he said: Isma'il ibn 'Ulayyah narrated to us, from Ayyub, from al-Hasan, who said: They said, "When the mosque was built, they said: 'O Messenger of Allah, how shall we build it?' He said: 'A canopy like the canopy of Moses.'"