(22) باب الْحَجِّ وَالنُّذُورِ عَنِ الْمَيِّتِ وَالرَّجُلُ يَحُجُّ عَنِ الْمَرْأَةِ
Narrated Ibn `Abbas:
A woman from the tribe of Juhaina came to the Prophet (ﷺ) and said, "My mother had vowed to perform Hajj but she died before performing it. May I perform Hajj on my mother's behalf?" The Prophet (ﷺ) replied, "Perform Hajj on her behalf. Had there been a debt on your mother, would you have paid it or not? So, pay Allah's debt as He has more right to be paid."
Reference: Sahih al-Bukhari 1852
In-book reference: Book 28, Hadith 32
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 29, Hadith 77