Musnad Ahmad 770:11

Muhammad ibn Ja‘far narrated to us, Shu‘bah narrated to us, from Mansur, who said: I heard Abu Wa’il narrating from a man, from Jarir, that he said: "I pledged allegiance to the Messenger of Allah, may Allah bless him and grant him peace, upon the establishment of prayer, the giving of zakat, sincerity to every Muslim, and the dissociation from the polytheist."