Musannaf Ibn Abi Shayba 37:268

Yazid ibn Harun narrated to us, from Muhammad ibn ‘Amr, from Abu Salamah, from Abu Hurayrah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "You will certainly follow the ways of those who were before you, span by span and cubit by cubit, until even if they were to enter a lizard’s hole, you would enter it." They said: "O Messenger of Allah, the Jews and the Christians?" He said: "Who else then?"