What is the evidence supporting the requirement of expiation of an oath when one vows walking for Hajj/Umrah but rides due to incapacity?
General Chapter
Al-Mughni
Book of Vows
Primary text
The evidence supporting the requirement of the expiation of an oath is the statement of the Prophet (peace be upon him) to the sister of 'Uqba ibn 'Amir: 'Let her walk, or ride, and let her expiate her oath.' Another narration mentions fasting for three days. Furthermore, the Prophet (peace be upon him) stated, 'The expiation of a vow is the expiation of an oath.' Walking is not an obligatory element of Ihram, so its abandonment does not necessitate a sacrificial animal, unlike neglecting an obligatory aspect of Ihram. The narration mentioning a sacrifice is considered weak.
Supporting text
If the person is capable of walking but neglects it, they have sinned and owe the expiation of an oath for neglecting the manner specified in the vow. By analogy with the school's established principles, they may be required to repeat the Hajj entirely walking, similar to breaking a vow of continuous fasting and performing it intermittently. If they become incapable after performing Hajj, they offer expiation, and the Hajj is valid. If they walk part of the way and ride part of the way, it is likely that they should perform Hajj again, walking what they rode and riding what they walked, or alternatively, the Hajj is not considered valid unless the entire journey was walked, as the apparent meaning of the vow dictates.