What is said about the graves of the Prophet, Abu Bakr, and Umar

Umm al-Mu'mineen Aisha (may Allah be pleased with her) says that the Messenger of Allah (peace and blessings be upon him) during his illness of death would repeatedly ask, "Where will I be today? Where will I be tomorrow?"—that is, he was waiting for the turn of Aisha (may Allah be pleased with her). Then, when the day of my turn came, Allah took his soul between my side and chest, and he was buried in my house.

Ameer-ul-Mu'mineen Umar bin Khattab (may Allah be pleased with him) says that: These six people with whom the Messenger of Allah (peace and blessings of Allah be upon him) remained pleased until his death (no one is more deserving of the caliphate than them, so choose a caliph from among them). Then he mentioned the names of these six people: Uthman, Ali, Talha, Zubair, Abdur Rahman bin Awf, and Sa'd bin Abi Waqqas (may Allah be pleased with them).