Musnad Ahmad Hadith 23032

It is narrated from Buraidah (may Allah be pleased with him) that a woman came to the service of the Holy Prophet (ﷺ) and said, "O Messenger of Allah! I had given a slave girl in charity to my mother. My mother has passed away, so that slave girl has come back to me as inheritance." The Holy Prophet (ﷺ) said, "Allah will reward you for it, and the slave girl has also come to you as inheritance." She said, "My mother passed away without performing Hajj. Can my performing Hajj on her behalf suffice for her?" The Holy Prophet (ﷺ) said, "Yes! You should perform Hajj on behalf of your mother."