It wasnarrated from Ibn Buraidah that his father said:
"A woman cametothe Prophet (ﷺ) and said: 'O Messenger of Allah, my mother hasdied and she owed a fast. Should I fast on her behalf?' He said:'Yes.'" (IT)
English reference (IT): Vol. 1, Book 7, Hadith 1759 (IT)
Arabic reference (IT): Book 7, Hadith 1831 (IT)