Musnad Ishaq

Benefits:
From the aforementioned hadith, it is understood that if a person is ill and there is a fear that the illness may worsen, or if there is a fear of an obstacle arising on the way, then he may enter into a conditional state of ihram. The benefit of this is that if he is compelled to exit the ihram, no expiation (fidya) will be obligatory upon him. However, if he did not make a condition and, for some reason, had to exit the ihram, then it is obligatory upon him to purchase a sacrificial animal, send it to Makkah through someone else, and when the time for the sacrifice arrives, he should exit the ihram. If it is not possible to send the sacrificial animal, then he should slaughter the sacrifice at the place of obstruction and shave his head to exit the ihram.

This is the fatwa of Sayyiduna Abdullah ibn Abbas radi Allahu anhuma and Imam Malik rahimahullah, that the sacrifice can be slaughtered at the place of obstruction itself. The evidence for this is that the Noble Prophet sallallahu alayhi wa sallam and his noble companions radi Allahu anhum were prevented at the occasion of Hudaybiyyah, and the Prophet sallallahu alayhi wa sallam slaughtered the sacrifice right there and exited the ihram. (See for details: Bukhari, before hadith: 1813)

Sayyiduna Abdullah ibn Umar radi Allahu anhuma holds the position that if one does not have the means for a sacrifice, then he should fast for ten days. (Bukhari, Book of Umrah, no. 1810)