Hadith 5:467
Yahya ibn Zakariyya ibn Abi Za'idah narrated to us, from Dawud, who said: I asked Sa'id ibn al-Musayyib: "What should a servant give in charity from his wealth?" He said: "A sa' (a specific measure) and the like of it."
حدثنا يحيى بن زكريا بن أبي زائدة عن داود قال سألت سعيد بن المسيب ما يتصدق به العبد من ماله قال الصاع وشبهه