Musannaf Ibn Abi Shayba 28:488

Hashim ibn al-Qasim narrated to us, he said: Abd al-Rahman ibn Thabit narrated to us, he said: Hassan ibn Atiyyah narrated to us, from Abu Munib al-Jurashi, from Ibn Umar, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, Allah has placed my provision under the shadow of my spear, and He has placed humiliation and lowliness upon those who oppose my command. Whoever imitates a people is one of them."