Which language was the Vedas originally written in?

The Vedas were originally composed and transmitted orally in Sanskrit. While there are no written copies of the Vedas from the Vedic period itself (around 1500-500 BCE), later written versions, like the Samhitas, were also in Sanskrit.

It's important to note that the Sanskrit of the Vedic period was different from the Classical Sanskrit that developed later. It was a more archaic form, with certain grammatical features and vocabulary that were later lost or evolved.