Is atonement (Kaffarah) obligatory upon killing a slave?

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Atonement is obligatory upon the killing of a slave. This is the position held by Abu Hanifa and Al-Shafi'i. The evidence supporting this ruling is the general statement of Allah Almighty: "And whoever kills a believer unintentionally, then [the penalty is] the freeing of a believing slave." (Quran 4:92). Furthermore, because retribution (Qisas) is obligatory for killing a slave, atonement must also be obligatory, just as it is for killing a free person. Additionally, the slave is a believer, thus resembling a free person, which differentiates the ruling from that applied to livestock.