I asked Abu Jafar Imam Muhammad ibn Ali Al-Baqir (as) about a man who accidentally killed a slave. Imam (as) said: "He must pay the slave's value, and his value should not exceed ten thousand dirhams." I asked: "Who will appraise his value when he is dead?" Imam (as) replied: "If the master has witnesses that his value on the day he was killed was such and such, then the killer must pay that amount. If the master has no witnesses, the killer must swear four times by Allah (swt) that the slave's value was no more than what he has appraised. If he refuses to swear and the oath is passed to the master, then the master is given the amount he swore upon, but the value must not exceed ten thousand dirhams." Imam (as) further said: "If the slave was a believer and he was killed intentionally, the killer must pay his value, free a slave, fast for two consecutive months, feed sixty needy people, and repent to Allah (swt), the Mighty and Majestic."