When the last moment of the life of Messenger of Allah ﷺ came he started putting his 'Khamisa' on his face and when he felt hot and short of breath he took it off his face and said, "May Allah curse the Jews and Christians for they built the places of worship at the graves of their Prophets." The Prophet ﷺ was warning (Muslims) of what those had done.  

لَمَّا نَزَلَ بِرَسُولِ اللَّهِ ﷺ طَفِقَ يَطْرَحُ خَمِيصَةً لَهُ عَلَى وَجْهِهِ فَإِذَا اغْتَمَّ بِهَا كَشَفَهَا عَنْ وَجْهِهِ فَقَالَ وَهْوَ كَذَلِكَ لَعْنَةُ اللَّهِ عَلَى الْيَهُودِ وَالنَّصَارَى اتَّخَذُوا قُبُورَ أَنْبِيَائِهِمْ مَسَاجِدَ يُحَذِّرُ مَا صَنَعُوا  

Messenger of Allah ﷺ said, "May Allah's curse be on the Jews for they built the places of worship at the graves of their Prophets."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ قَاتَلَ اللَّهُ الْيَهُودَ اتَّخَذُوا قُبُورَ أَنْبِيَائِهِمْ مَسَاجِدَ