What is the ruling on someone who hired a person to slaughter his sacrificial animal, and after it was done, it became clear that he was a Hindu, knowing that the Hindu pronounced the name of Allah but did not slaughter it himself, rather the disbeliever slaughtered it himself? And what is the difference between one who pronounces the name of Allah and a machine that slaughters?

The animal slaughtered by a Hindu is not sufficient as an udhiyah (sacrificial offering), because his slaughtered animal is maytah (carrion), which is unlawful. His slaughtering is no more than a voluntary hady (offering during Hajj/Umrah) which does not require a replacement if it perishes. It is not permissible to consider the disbelieving slaughterer as a mere tool. His slaughtered animal is maytah in every respect, for the animal slaughtered by a non-People of the Book disbeliever is like maytah in its prohibition. The Shari'ah (Islamic law) equates them in the legal term for maytah, for the term maytah in Shari'ah is broader than its linguistic meaning. The Shari'ah does not equate them in the linguistic meaning of maytah. The impurity that necessitates prohibition may be apparent or hidden. For example, blood stagnation in a maytah is an apparent cause. However, as for the animal slaughtered by a Magian, an apostate, one who intentionally omits the name of Allah, or one who slaughters for other than Allah, the very act of their slaughtering imparts an impurity to the slaughtered animal, rendering it unlawful.