From Sahih Bukhari (Hadith 4441):
Narrated `Urwa bin Az-Zubair:`Aisha said, "The Prophet (ﷺ) said during his fatal illness, "Allah cursed the Jews for they took the graves of their prophets as places for worship." `Aisha added, "Had it not been for that (statement of the Prophet ) his grave would have been made conspicuous. But he was afraid that it might be taken as a place for worship
Reference: Bukhari 4441