The last words spoken by the Prophet ﷺ were, "Expel the Jews of the Hijaz and the people of Najran from the Arabian Peninsula, and know that the worst of people are those who took the graves of their prophets as places of worship."
حدثنا يحيى بن سعيد حدثنا إبراهيم بن ميمون حدثنا سعد بن سمرة بن جندب عن أبيه
آخر ما تكلم به النبي ﷺ أخرجوا يهود أهل الحجاز وأهل نجران من جزيرة العرب واعلموا أن شرار الناس الذين اتخذوا قبور أنبيائهم مساجد
Its isnad is sahih. Ibrahim bin Maymun Nahhas, freedman of the family of Samura, is trustworthy. Ibn Main deemed him trustworthy, and Bukhari mentioned him in al-Kabir 1/1/325-326, saying, He heard from Saad bin Samura, and Ibn Uyayna, Yahya Qattan, and Waki heard from him.Saad bin Samura bin Jundab Fazari is trustworthy. It is stated in al-Tajil 148, Nasai said in al-Tamyiz, Saad bin Samura is trustworthy. Husayni said, Ibn Habban deemed him trustworthy, but this is what he said, though I have not seen it in my copy of Ibn Habban's Thiqat.The hadith is in Majma al-Zawaid 5:325, where it is stated, Ahmad narrated it through several chains, and the narrators of two of these chains are trustworthy with a connected isnad, and Abu Yaala also narrated it. By this he means 1694, and by the third he means 1699. And in 2:28 he attributed it to Bazzar alone, saying, Its narrators are trustworthy. See also 1884.