Musnad Ahmad 30:1671

Khalaf ibn al-Walid narrated to us, he said: Abu Ma'shar narrated to us, from Sa'id, from Abu Hurayrah, he said: The Messenger of Allah, may Allah bless him and grant him peace, said: "People shall surely abandon their boasting about the Jahiliyyah (pre-Islamic era), or they shall surely be more hateful to Allah the Almighty than the dung beetles."