Firdawsi, The Persian Literature, Comprising The Shah Nameh…
“ Nearly half of Irán is in the possession of Rustem." "Give me the crown," said Isfendiyár, "and I will immediately proceed against the Zabúl champion." "I have given thee both the crown and the throne, take with thee my whole army, and all my treasure.—What wouldst thou have more? He who has conquered the terrific obstacles of the Heft-khan, and has slain Arjásp and subdued his entire kingdom, can have no cause to fear the prowess of Rustem, or any other chief." Isfendiyár replied that he had no fear of Rustem's prowess; he was now old, and therefore not equal to himself in strength ”
