Musnad Ahmad 26:417

Yahya ibn Adam narrated to us, Sufyan narrated to us—and he mentioned the Tashahhud, the Tashahhud of Abdullah—he said: Abu Ishaq narrated to us, from Abu al-Ahwas, from Abdullah, from the Prophet, may Allah bless him and grant him peace. And Mansur, and al-A’mash, and Hammad, from Abu Wa’il, from Abdullah, from the Prophet, may Allah bless him and grant him peace, the like of it.