Historian Robert Sewell quotes a contemporary chronicler Ferishta, who notes: The plunder was so great that every private man in the allied army beca… - Mohammed Qacim Ferichta

Before he ascended the throne, he had once a quarrel with a holy man who maintained that it was highly improper for a king to interfere with the religion of his subjects or to prevent them from bathing at places to which they had been accustomed to resort for ages. The prince ( Sikandar ) drew his sword and said "Do you maintain the propriety of Hindu religion."

In 1018 CE Mahmud attacked the holy town of Mathura, the land of Lord Krishna, considered one of the richest in the northern belt, after the abject surrender of the Gurjara Pratihara ruler Rajyapala. Just to give an idea of the amount of loot that Mahmud managed to ship back to Ghazni during each of his plunders of India, this is the account of his campaign in Mathura by Ferishta:
It is said that the Sultan found in Muttra [Mathura] five great idols of pure gold, with eyes of rubies, each of which eyes was worth fifty thousand dinars. Upon another idol, he found a sapphire, weighing four hundred miskal; and the image being melted down, produced ninety eight thousand three hundred miskal of pure gold. Besides these, there were above a hundred idols of silver, which loaded a hundred camels with bullion. The Sultan having tarried here twenty days, in which time the city suffered greatly from fire, besides what it suffered from the hand of ravage and desolation, he marched against the other fortified places in these districts …

[Mahmud of Ghazni] ‘found in this temple, a greater quantity of jewels and gold, than, it is thought, any royal treasury, ever contained before’.