(26) باب إِذَا وَقَفَ أَرْضًا وَلَمْ يُبَيِّنِ الْحُدُودَ فَهْوَ جَائِزٌ، وَكَذَلِكَ الصَّدَقَةُ
Narrated Ibn `Abbas:
A man said to Allah's Messenger (ﷺ) , "My mother died, will it benefit her if I give in charity on her behalf?" The Prophet (ﷺ) replied in the affirmative. The man said, "I have a garden and I make you a witness that I give it in charity on her behalf."
Reference: Sahih al-Bukhari 2770
In-book reference: Book 55, Hadith 33
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 51, Hadith 31