What was the language of Hindus and Incas?

This is a bit of a tricky question because it conflates two very different cultures and time periods.

* Hindus: Hinduism is a religion, not a single ethnicity or nation. There are hundreds of languages spoken by Hindus across India, Nepal, Bangladesh, Indonesia, and other parts of the world. There is no single "language of Hindus."

* Incas: The Incas were an empire that ruled over a vast region in South America. Their primary language was Quechua. It's still spoken today by millions of people in the Andes region.

It's important to understand that language and culture are not directly linked. Just like in the modern world, there are many languages spoken within a single religion or civilization.