Musannaf Ibn Abi Shayba 3:115

Muhammad ibn Bishr told us, he said: Sa'id told us, he said: Al-Walid told us, from Ghaylan ibn Jarir, from Mutarrif ibn 'Abd Allah ibn al-Shikhkhir, who said: I and 'Imran ibn Husayn prayed with 'Ali. He would say the takbir when he prostrated and when he raised his head. When he turned away from his prayer, he said: "This prayer of ours is like the prayer of the Messenger of Allah, may Allah bless him and grant him peace."