Is it true what the Shia claim, that the Companions did not attend the funeral of the Prophet, may Allah’s prayers and peace be upon him, and where were they at that time? Are there any hadiths that support this claim?

Lying is one of the most reprehensible traits, and the Prophet, peace and blessings be upon him, warned against it. The Shi'a are known for lying, and the imams of Islam have unanimously agreed on this. The Prophet, peace and blessings be upon him, passed away and was buried after all the people of Medina prayed over him. The Companions loved him more than themselves and attended his funeral and burial. Whoever slanders the Companions slanders the Messenger, peace and blessings be upon him, and the claim that the Companions did not attend the Prophet's burial is a fabrication by a people whose hearts are filled with malice.