Musnad Abu Ya'la al-Mawsili 42:179

Zakariya ibn Yahya Zahmuwayh narrated to us, Salih ibn Umar narrated to us, from Mutarrif, from Atiyyah, from Abu Sa’id, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "When the Banu al-Hakam reach thirty [in number], they will take the religion of Allah as a means of deception, the servants of Allah as slaves, and the wealth of Allah as something to be circulated among themselves."