Must the father offer a legal expiation after the death of his sick daughter, whom he was treating with some herbs, following the accidental administration of a large quantity of it at once, which led to her death, knowing that she was not legally accountable? And will the reward for the righteous deeds performed by the father reach her?

The fundamental principle is the presumption of innocence. If it is highly probable that the cause of the girl's death was the complete administration of the injection, then the person responsible must offer expiation (kaffarah (definition)) and pay blood money (diyah), unless the heirs pardon.

The expiation is the freeing of a believing slave; if one cannot be found, then fasting for two consecutive months. The blood money is incumbent upon the 'aqilah (male relatives on the father's side); if they are not available, then from the Muslim treasury (Bayt al-Mal); otherwise, from the private wealth of the person responsible. The blood money is to be distributed among the heirs of the deceased, but the person responsible does not inherit from it. It is recommended for the person responsible to increase in good deeds and supererogatory acts of worship.