What is the problem between Al-Abbas and Ali, may Allah be pleased with them both, mentioned in the hadith, and why did Al-Abbas describe Ali as a liar, a sinner, treacherous, and a betrayer? Did Al-Abbas intend that meaning, or is it an error on the part of the narrators? And what was the issue that made Umar, may Allah be pleased with him, mention the hadith "We do not inherit; what we leave behind is charity," despite everyone's knowledge of it?

Summary of the answer:

Muslim narrates the story of the dispute between Al-Abbas and Ali with Umar concerning the inheritance of the Prophet, peace and blessings be upon him. Umar clarified that the Prophet said: "We do not inherit; what we leave behind is charity." Umar and Abu Bakr understood that the wealth was charity and not to be inherited, and they acted accordingly. Then they handed it over to Al-Abbas and Ali on condition that they manage it as the Messenger of Allah, peace and blessings be upon him, had managed it. As for Al-Abbas's description of Ali as "the liar, the sinful, the treacherous, the perfidious," this is to be understood as a father's words to his son or a mistake on the part of the narrators. The dispute between Al-Abbas and Ali was not over inheritance, but rather over how to manage and supervise the charity funds.