Sayyiduna Abu Ubaydah bin al-Jarrah (may Allah be pleased with him) says that the last words the Messenger of Allah (peace and blessings be upon him) spoke were: "Expel the Jews from the Hijaz and the people of Najran from the Arabian Peninsula. And know that the worst of people are those who have taken graves as places of prostration."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18749