What is the ruling on performing 'Umrah after completing Hajj?

Question:
He says: A person performed Hajj, and then after Hajj he performs 'Umrah from at-Tan'im. What do you say about those who do this frequently...?

Answer:
If they have not previously performed the obligatory 'Umrah, they should perform 'Umrah after Hajj. If they have already performed it, that is sufficient for them. They should not cause confusion for the people, nor should they crowd them. It is sufficient, and praise be to Allah. This is because there is severe crowding after Hajj. Therefore, it is better for the believer, if he has already performed 'Umrah, not to crowd the people, not to make things difficult for the people and for himself, but to give the people more space.
The Companions, with the Prophet (peace and blessings be upon him), did not have anyone perform 'Umrah after they finished their rituals. They headed to Madinah. The Messenger and his Companions did not perform 'Umrah. None of them performed 'Umrah except A'ishah alone. So A'ishah asked the Prophet (peace and blessings be upon him), and he made her perform 'Umrah. Otherwise, the scholars mentioned that none of the Companions performed 'Umrah after Hajj, nor did the Prophet (peace and blessings be upon him). We have an example in them.
So it is better to leave that; because this leads to crowding and hardship. Except for a person who has not previously performed 'Umrah—has not performed 'Umrah in Islam—then he should perform 'Umrah after Hajj. And if it is easy for him to delay until the people have dispersed, that is good.