Permission Quotes - page 7
When Hajjaj, the governor of Iraq, asked the Caliph for permission to send another expedition, the Caliph wrote back: "This affair will be a source of great anxiety and so we must put it off, for every time an army goes, [vast] numbers of Mussalmans are killed. So think no more of such a design.” But Hajjaj was a very tenacious imperialist. He spent the next four years in equipping an army more formidable than any which had so far been sent against Sindh. While sending off his nephew as well as son-in-law, Muhammad bin Qasim, with this army in AD 712, Hajjaj said: "I swear by Allah that I am determined to spend the whole wealth of Iraq, that is in my possession, on this expedition.”.
Muhammad bin Qasim