Musannaf Ibn Abi Shayba 33:140

Waki’ narrated to us, from Isma’il bin Abi Khalid, from al-Sha’bi, who said: When Mu’adh arrived in Yemen, he addressed the people. He praised Allah and extolled Him, and said: "I am the messenger of the Messenger of Allah to you, that you should worship Allah, not associating anything with Him, and that you should establish prayer and give zakat. It is only Allah alone, and Paradise and the Fire. An abiding that has no departure, and an eternity that has no death."