Ishaq narrates from his father, who said that Hazrat Mus'ab bin Zubair came to Hazrat Abdullah bin Umar while he was performing Sa'i between Safa and Marwah. Hazrat Ibn Umar (may Allah be pleased with them both) asked, "Who are you?" He replied, "Your nephew, Mus'ab bin Zubair." Ibn Umar (may Allah be pleased with them both) asked, "From Iraq?" He replied, "Yes." Mus'ab bin Zubair said, "I have come to ask you about those people who have left obedience, shed blood, and made wealth lawful upon themselves. They were fought against and overpowered. They entered a fort, were besieged in it, then they sought amnesty, were granted safety, and then were killed." Hazrat Ibn Umar (may Allah be pleased with them both) asked, "How many were they?" He replied, "Five thousand." The narrator said that at that time Hazrat Ibn Umar (may Allah be pleased with them both) said, "Subhan Allah," and said, "O Ibn Zubair, may Allah grant you a long life. If a man were to come among Zubair's cattle and slaughter five thousand of them in one morning, would you consider him to have exceeded the limits?" Hazrat Mus'ab replied, "Yes." Hazrat Ibn Umar (may Allah be pleased with them both) said, "You consider it excess in cattle who do not know Allah, and you deem their blood lawful, those who declare the purity of Allah and recite the Kalimah, all in one day?"