3 verses refuting the worship of graves

Allah Almighty said:

They worship along with Allah that which does not harm them and does not benefit them. They say: ” They are our intercessors with Allah.” Say: “Can you tell Allah such things in heaven and on earth that He does not know?” Exalted is He and above those whom you associate as partners.
Sura 10 Yunus: verse 18

He also said:

Verily, pure faith can be dedicated to Allah alone. And those who took other patrons and helpers instead of Him say: “We worship them only so that they bring us closer to Allah as close as possible.” Allah will judge between them in what they disagreed about. Verily, Allah does not guide those who lie and disbelieve.
Sura Zumar 39: verse 3

He also said:

He lengthens the day at the expense of the night, and lengthens the night at the expense of the day. He has subdued the sun and the moon, and they move until their appointed time. Such is Allah, your Lord. He owns the authority, and those to whom you call besides Him do not even own a chick on a date-stone.

When you call to them, they do not hear your prayer, and even if they did, they would not answer you. On the Day of Resurrection they will reject your worship. No one will tell you like the Knower.
Surah Fatir 35: verses 13-14