Musnad Ahmad 8:147

Abu Kamil narrated to us, Ibrahim bin Sa'd narrated to us, Salih bin Kaysan narrated to us, from Ibn Shihab, from Muhammad bin Abi Sufyan bin Al-'Ala' bin Jariyah, from Yusuf bin Al-Hakam Abu Al-Hajjaj, from Sa'd bin Abi Waqqas, who said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "Whoever insults Quraysh, Allah the Almighty and Majestic will insult him."