Prayer: Is It Necessary to Repeat Prayers Performed in Leather of Doubtful Slaughter?

Practical Laws of Islam as per the teachings of Imam Khamenei

Prayer: Is It Necessary to Repeat Prayers Performed in Leather of Doubtful Slaughter?

English:

Question #429:

A person used to perform his prayers for a period of time while wearing clothes made of the leather of an animal about which there was doubt as to whether it was ritually slaughtered while the prayer is invalid with that leather. Should he say the prayers again? In general, what is the ruling on an animal about which there was doubt as to whether it was ritually slaughtered?

Answer #429:

The rule for such an animal is similar to the rule for an animal that was not ritually slaughtered in that it is ḥarām to eat the meat or to perform prayer with the leather, but it is considered pure. Nevertheless, if the previous prayers were performed in ignorance about this rule, they are ruled as correct.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Prayer