Acts of worship in which representation and agency are permissible

What are the acts of worship in which representation is permissible, with an explanation of the conditions for representation in each case?
Answer: The acts of worship in which representation is allowed are of several types: Hajj, 'Umrah, and the distribution of zakah. One may hire a trustworthy person to distribute the zakah, and hire a trustworthy person to perform Hajj on his behalf if he is unable, such as an elderly man who is incapacitated, an elderly woman, or a patient whose recovery is not expected. The same applies to 'Umrah. The same applies to the distribution of expiations; one may hire someone to distribute the expiation for intercourse during Ramadan, or the expiation for zihar, if he is unable to free a slave or fast. This also applies to anyone who hires someone to distribute the feeding of sixty poor people on his behalf. Likewise, one may appoint an agent to purchase the slave that is due on him for intercourse in Ramadan, or for forbidding his wife, or for killing. All of these are among the acts of worship in which representation is allowed. Yes.