Musnad Abu Ya'la al-Mawsili 155:323

Ishaq ibn Abi Isra'il narrated to us, al-Nadr ibn Shumayl narrated to us, Shu'bah narrated to us, from Abu Ishaq, who said: I heard al-Agharr, who said: I heard Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, Allah, Blessed and Exalted is He, confirms the servant in five things he says. When he says: 'There is no god but Allah, He has no partner,' He says: 'My servant has spoken the truth.' And when he says: 'There is no god but Allah, and Allah is the Greatest,' He says: 'My servant has spoken the truth.' And when he says: 'There is no god but Allah, and praise be to Allah,' He says: 'My servant has spoken the truth.' And when he says: 'There is no god but Allah, to Him belongs the dominion and to Him belongs the praise,' He says: 'My servant has spoken the truth.'"