Ismail bin Ayash says: I asked Ishaq bin Abdullah, and he said: Sayyiduna Umar bin Khattab (may Allah be pleased with him) wrote to Amr bin al-As (may Allah be pleased with him) that: "Those who accepted Islam secretly and died, their wealth will go to the Bayt al-Mal (public treasury), and whoever joins a people and sheds blood with them, and has no relation or favor with them, then give his inheritance to them."