Musannaf Ibn Abi Shayba 3:5175

Asbat ibn Muhammad narrated to us, from Sa'id, from Qatadah, from Sa'id ibn al-Musayyib, from Aisha: That the Messenger of Allah (may Allah bless him and grant him peace) said: "May Allah curse a people who took the graves of their prophets as places of worship (mosques)."