What is the ruling on performing 'Umrah on behalf of a living person?

Question:
Is it permissible for me to perform 'Umrah on behalf of a man who has been imprisoned for more than a year?

Answer:
If it is a voluntary 'Umrah, then there is no report that a living person performs a voluntary 'Umrah on behalf of another. But if it is an obligatory 'Umrah, it does not suffice until he performs it for himself when he leaves prison. When he leaves prison, he performs 'Umrah al-Islam for himself. One does not act as a substitute for him unless he dies. Be aware that substitution in Hajj and 'Umrah is only for the deceased or for a living person who is unable to perform the obligatory Hajj or obligatory 'Umrah. A living person who is unable, meaning one who has despaired of being able to come and perform 'Umrah or Hajj, may have someone perform it on his behalf. As for a living person who is able and strong, no one acts as a substitute for him in Hajj or 'Umrah. Yes.