Hebrews 1:1 New International Version (NIV)
1 In the past God spoke to our ancestors through the prophets at many times and in various ways,
The Bible says that in the past, in ancient times before the coming of the Messiah, God spoke to people through the prophets, like Isaiah, Jeremiah, Ezekiel some of the Old Testament prophets. It could be posited that Buddha, Zoroaster, etc. would fit in here.
But if you watch this video, Buddha had prophesied about the coming of Jesus Christ. The Zoroastrian scriptures also speak about a future coming of a Saoshyant which may have been Jesus Christ. Saoshyant (Saoshyans) is a Zoroastrian term for “savior.”
Hebrews 1:2-3 New International Version (NIV)
2 but in these last days he has spoken to us by his Son, whom he appointed heir of all things, and through whom also he made the universe. 3 The Son is the radiance of God’s glory and the exact representation of his being, sustaining all things by his powerful word. After he had provided purification for sins, he sat down at the right hand of the Majesty in heaven.