The Office of the Supreme Leader

Jurisprudence & Religious affairs

Confirming prayer time arrival
Does the time of prayer start as soon as adhān begins to be recited, or is it obligatory to wait till adhān is over? And is it permissible for a fasting person to end his fast as soon as adhān begins or is it obligatory for him to wait until it ends?
shoes made from leather of animals
When using leather shoes, the leather for which was made from an animal that was not ritually slaughtered, is it obligatory to wash one’s feet every time before performing wuḍū’? Some say: It is necessary to do so if the feet perspire in the shoes. And I have observed that the feet do sweat, either slightly or profusely, in all kinds of shoes. What is your opinion on this issue?
Treating with narcotic drugs
Is it permissible to use narcotic drugs for the treatment of diseases?  And assuming that it is permissible, is it absolutely permissible or in case that it is the only way of treatment?
 the prayer with tayammum
A person prays with tayammum due to shortness of time, and after completing the prayer he comes to know that there was enough time to do wuḍū’. What is the rule concerning his prayer?