His statement, “and the sacrificial offering for being prevented from completing the pilgrimage”: the definite article here refers to what is understood in the mind—that is, a prevention which allows a person to exit his rite. According to the well-known view of the madhhab, being prevented refers only to being barred by an enemy.
It has also been said that being prevented includes everything that keeps a person from completing his rite, whether an enemy or something else, such as the loss of one’s provisions, illness, a fracture—that is, a pilgrim’s sustaining a fracture, for example—and similar matters. This view is sounder, and it will come later, Allah willing, in the discussion of missing the pilgrimage and being prevented.
Thus, the sacrificial offering for being prevented is due wherever its cause arises. It is well known that, in most cases, a person who has been prevented cannot reach the Sacred Precinct. Yet he may be prevented from entering Mecca—that is, while he is between the boundaries of the Sacred Precinct and Mecca. We therefore say that he should slaughter the sacrifice wherever its cause arose. The evidence for this is that when the polytheists prevented the Prophet, peace and blessings be upon him, during the minor pilgrimage of al-Hudaybiyyah, he ordered the sacrificial animals to be slaughtered at that location (1), and they slaughtered them there. He was not required to transport them to Mecca, because he had been prevented from reaching it.
His statement, “wherever its cause arises”: “wherever” is an adverb of place; that is, it is due wherever the cause arises, whether outside or within the Sacred Precinct. Thus, if a person enters the state of ihram at Qarn al-Manazil and commits a prohibited act at al-Shara’i, which is before the boundaries of the Sacred Precinct, he may offer the expiation in that very place. Likewise, if he enters the state of ihram at al-Hudaybiyyah and commits a prohibited act on his way to Mecca before reaching the boundaries of the Sacred Precinct, he may offer the expiation at the place where he committed the prohibited act; and he may also transfer it to the Sacred Precinct, because whatever is permissible outside the Sacred Precinct