What is the evidence for the permissibility of going out to the open land (al-Hil) and performing 'Umrah for one who is not from the people of Makkah?

Question:
This questioner says: Is it established in the Sunnah of the Messenger of Allah (peace and blessings be upon him) or in the actions of the Companions regarding going out to the open land and performing 'Umrah for one who is not from the people of Makkah?

Answer:
Yes, this is established in the hadith of where she was performing Tamattu' with 'Umrah for Hajj. Then menstruation came upon her before she could perform the Tawaf of 'Umrah, and the menstruation continued with her until the Day of Tarwiyah. The Prophet (peace and blessings be upon him) said to her: Enter the state of Ihram for Hajj, enter the state of Ihram for Hajj. So she entered the state of Ihram for Hajj and included it with her 'Umrah, becoming one performing Qiran instead of Tamattu'. When they finished Hajj, she asked the Prophet (peace and blessings be upon him) to let her perform an independent 'Umrah, as if she was not satisfied with the 'Umrah that was included with the Hajj as Qiran. So she asked the Prophet (peace and blessings be upon him) to let her perform 'Umrah because she wanted to perform an independent 'Umrah. The Prophet (peace and blessings be upon him) said to her: Your 'Umrah that is with the Hajj, your Tawaf for the Hajj and your Sa'y is for your Hajj and your 'Umrah. But she refused unless the Prophet (peace and blessings be upon him) let her perform 'Umrah. So he sent her with her brother 'Abd al-Rahman ibn Abi Bakr. He sent her to al-Tan'im, so she entered the state of Ihram from al-Tan'im because it is the closest point of the open land, the closest point of the open land. This is evidence that if one wants to perform 'Umrah while in Makkah, he does not enter the state of Ihram from Makkah, but rather he goes out to the open land, either to al-Tan'im, or to al-Ja'ranah, or to 'Arafah, or to al-Hudaybiyyah, and enters the state of Ihram from outside the Haram. One does not enter the state of Ihram for 'Umrah from the Haram, but rather from the open land.