Dit gaat om de bid'ah die shirk inhoudt
The second type is bid'ah (innovation), which is visiting graves for the purpose of calling upon their occupants, seeking their help, offering sacrifices to them and making vows to them. This is forbidden and is a major form of Shirk (shirk akbar). Connected to this is the practice of visiting graves to offer du'aa', perform salaah and read Qur'aan there. This is all bid'ah and is not prescribed in Islam.
Bron: https://islamqa.info/en/6744
