Sahih al-Bukhari 2762
صحيح البخاري#2762SahihNarrated Ibn `Abbas:That the mother of Sa`d bin Ubada the brother of Bani Saida died in Sa`d's absence, so he came to the Prophet saying, "O Allah's Messenger (ﷺ)! My mother died in my absence, will it benefit her if I give in charity on her behalf?" The Prophet (ﷺ) said, "Yes." Sa`d said, "I take you as my witness that I give my garden Al-Makhraf in charity on her behalf
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 55:25