(6) باب الفوات والإحصار
A'ishah (RAA) narrated, 'The Messenger of Allah (ﷺ) went to visit. Duba'ah bint Az-Zubair bin 'Abdul Muttalib. She said to him, 'O Messenger of Allah I have made the intention to perform Hajj but I am suffering from an illness.' He said to her, "Perform Hajj but set a condition that you shall be relieved of the Ihram whenever you are prevented (due to illness, etc.)." Agreed upon.
Reference: Bulugh al-Maram 781
In-book reference: Book 6, Hadith 73
English translation: Book 6, Hadith 800