When was the holy book of Hinduism made?

Answer 1

The Vedas are among the oldest sacred texts. The Samhitas date to roughly 1500-1000 BCE, and the "circum-Vedic" texts, as well as the redaction of the Samhitas, date to c. 1000-500 BCE, resulting in a Vedic period, spanning the mid 2nd to mid 1st millennium BCE, spanning the Late Bronze Age and the Iron Age. To sum up mainstream estimates, according to which the Rigveda was compiled from as early as 1500 BCE over a period of several centuries.