Hazrat Shaqiq bin Salamah Asadi (may Allah have mercy on him) narrates that Sayyiduna Umar bin Khattab (may Allah be pleased with him) sent Salamah bin Qais Ashja’i (may Allah be pleased with him) from Harrah to fight against a group of the people of Persia, and said:“Set out in the name of Allah, strive in the path of Allah, fight those who deny Allah, do not be treacherous, do not deceive, do not mutilate the dead, do not kill a woman, nor a child, nor an old man. When you reach them, invite them to Islam and to jihad; if they accept, then they are among you, they will have the same rights as you and the same responsibilities as you. If they refuse, then invite them to Islam only, without jihad; if they accept, then accept them, but do not give them a share in the spoils of war. If they refuse, then invite them to pay jizyah; if they agree, then set the jizyah according to their ability, and appoint an army over them to fight those who come after them. If they still refuse, then fight them. If they ask you for protection in the name of Allah and His Messenger (peace and blessings be upon him), do not grant it, but grant protection from yourselves. Then if they refuse, fight them, Allah will grant you victory over them.”

Then we went and invited them to all these things, but they did not accept, until the siege became severe. They said:“Grant us protection in the name of Allah and His Messenger.”We said:“No, but we grant you protection from ourselves.”Still, they did not accept. We fought, and one Muslim was martyred, then Allah granted us victory. We took possession of their wealth, slaves, and riches. Then our commander Salamah bin Qais (may Allah be pleased with him) entered their temple, saw two chests, and asked:“What are these?”It was said:“These are the treasures of their temple.”When they were opened, extremely valuable treasures came out. Then he asked the people:“Do you willingly give this wealth for the Caliph?”All said:“Yes, we make Allah a witness.”Salamah sent me to take this wealth to the Caliph Umar bin Khattab (may Allah be pleased with him). When I reached Madinah, I searched for him and found him leaning on a stick, feeding people, with very simple food, and eating himself as well. I said:“I have something to discuss with you.”He went into a simple hut. I also went inside, and there was a state of hunger. I informed him about the wealth. When Umar (may Allah be pleased with him) heard about this wealth, he became very angry and said:“By Allah! Umar will not live in luxury by taking possession of the Muslims’ wealth while the Muslims are hungry and thirsty facing the enemy.”Then he ordered:“Take this wealth back, distribute it, and divide it among the Muslims.”