Short answer

Human poets, by the hymns' own account. The Rig Veda's poets say they "fashioned" their hymns, as a craftsman makes a chariot. They call their hymns "new", give their own names, and speak of seers "old and recent". One poet says a king paid him in cows and chariots. Later schools called the Veda authorless, but they do not agree on where it came from. Which books count is not settled either. Hindus rank the Veda highest, yet they differ on which Upanishads (the philosophical texts at the end of the Veda) belong to it. The epics and Puranas are called the "Fifth Veda". The Qur'an speaks of itself the opposite way. It presents itself as God's (﷾) speech from start to finish. It tells the Prophet (ﷺ) what to say and warns him never to invent a word. It is one book, the same for every Muslim.

Read the full explanation

See your saved pages