Is a person held accountable if they unintentionally harm someone, such as bumping into them without intent, and is there any sin upon him for that?

The story narrated by Al-Tabarani in "Al-Kabeer" about the Prophet, peace and blessings be upon him, seeking retribution from those who harmed him, and Ukasha demanding retribution from him, followed by the mention of the Prophet's illness and death, is a false and fabricated story that is not authentic. Ibn Al-Jawzi described it as "a fabricated absurdity," and identified Abdul Mun'im bin Idris as the accused fabricator.

This hadith does not contradict the jurisprudential rules which state that a person is not held accountable for unintentional mistakes, thus there is no sin upon a person for it. The questioner's example falls under this, as Allah Almighty says: "And there is no blame upon you for that in which you have erred, but [only for] what your hearts intended," and as the Prophet, peace and blessings be upon him, said: "Indeed, Allah, the Mighty and Exalted, has overlooked for my Ummah [nation] mistakes, forgetfulness, and what they are compelled to do."

The lifting of sin for an error does not negate accountability for compensation. In the case of property damage, the one who caused the damage is liable for what he damaged, because intent and error are the same when it comes to people's property.