Musnad Ahmad 11:5

Abu Ahmad al-Zubayri narrated to us, Ibrahim ibn Maymun narrated to us, from Sa'd ibn Samurah, from Samurah ibn Jundab, from Abu Ubaydah ibn al-Jarrah, who said: The last thing that the Prophet of Allah, peace and blessings of Allah be upon him, spoke was: "Expel the Jews of the Hijaz from the Arabian Peninsula, and know that the most evil of people are those who take graves as places of worship."