Hadith 17:804
Yazid ibn Harun narrated to us, he said: Muhammad ibn ‘Amr narrated to us, from Abu Salamah, from Abu Hurayrah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever claims allegiance to other than his own masters, upon him is the curse of Allah, the angels, and all of mankind."
حدثنا يزيد بن هارون قال حدثنا محمد بن عمرو عن أبي سلمة عن أبي هريرة قال قال رسول الله صلى الله عليه وسلم من تولى غير مواليه فعليه لعنة الله والملائكة والناس أجمعين