"'A'isha and Abdullah reported: As the Messenger of Allah (may peace be upon him) was about to breathe his last, he drew his sheet upon his face and when he felt uneasy, he uncovered his face and said in that very state: Let there be curse upon the Jews and the Christians that they have taken the graves of their apostles as places of worship. He in fact warned (his men) against what they (the Jews and the Christians) did." -- Sahih Muslim 1082
"Narrated 'Aisha: Allah's Apostle in his fatal illness said, 'Allah cursed the Jews and the Christians, for they built the places of worship at the graves of their prophets.' And if that had not been the case, then the Prophet's grave would have been made prominent before the people. So (the Prophet ) was afraid, or the people were afraid that his grave might be taken as a place for worship." -- Sahih Bukhari 2.23.472
According to Islamic tradition, Muhammad died on June 8, 632, after once again cursing the Jews and Christians.