Kitab Al Hind Here

The Sultan laughed. "What is there to learn from a conquered land?"

In it, Al-Biruni wrote a warning that echoes even today: "The Hindus think there is no country like theirs, no science like theirs. And the Muslims think the same of their own. Each clings to custom and calls the other barbarian. But a wise traveler knows: custom is just the wall of a house—not the sky."

And so Al-Biruni went to India.

At first, Al-Biruni tried to talk to the Hindu priests using an interpreter. But the priest grew angry. "You are a foreigner, a mlechchha ," the priest said. "You cannot understand our Vedas. You cannot eat with us. You are impure."

Al-Biruni smiled. "A mirror does not judge the face it reflects. It simply shows it clearly. If I only see them through my own eyes, I will write a book of my own prejudices. I want to write a book of their truth." kitab al hind

Once he understood the language, Al-Biruni began writing. He did not write to praise or to condemn India. He wrote to describe it. He used a brilliant method: he would explain a Hindu idea, then immediately compare it to a similar idea from Greek philosophy or Islamic science.

He finished his book in 1030 CE. He called it Kitab fi Tahqiq ma li'l-Hind —"The Book of Verifying What Belongs to India." It had 80 chapters covering: Hindu religion, caste, marriage, astronomy, geometry, medicine, law, festivals, and even the game of chess. The Sultan laughed

Al-Biruni was not interested in treasure. When the Sultan returned from his raids, Al-Biruni asked only for one thing: