Musnad Ahmad 200:1

Yazid ibn Harun narrated to us, he said: Abu Malik al-Ashja‘i informed us, from his father, that he heard the Prophet, peace and blessings of Allah be upon him, while he was saying to a group of people: "Whoever professes the oneness of Allah the Exalted, and disbelieves in what is worshipped besides Him, his wealth and his blood become inviolable, and his reckoning is with Allah the Mighty and Majestic." Yazid narrated it to us in Wasit and Baghdad, and he said: "He heard the Prophet, peace and blessings of Allah be upon him."