Hadith 29:38
Hushaym narrated to us, from Husayn, from someone who witnessed [the Battle of] al-Qadisiyyah, who said: While a man was bathing, the water and the soil uncovered for him a brick of gold. He came to Sa’d and informed him. He [Sa’d] said: "Place it among the spoils of the Muslims."
حدثنا هشيم عن حصين عمن شهد القادسية قال بينا رجل يغتسل إذ فحص له الماء والتراب عن لبنة من ذهب فأتى سعدا فأخبره فقال اجعلها في غنائم المسلمين