When Moses was leading The Jew out of Egypt, God lead through a a pillar of fire and a cloud.
Mount Sinai
Moses is tall enough to talk to god but short enough not to intimidate him.
The first time Moses heard gods voice was from the burning bush.
The first time God speaks to Moses, Moses hears the voice of God coming from a burning bush that is not comsumed by the flames
It was God who spoke from the burning bush, and not Moses. it happened once.
Moses talk with God
First of all Moses is a normal man, and not God in anyway.
God first revealed his name as Yahweh to Moses in the Old Testament, specifically in the book of Exodus, when He spoke to Moses from a burning bush and instructed him to lead the Israelites out of Egypt.
Moses was a shepard. One day a bush caught on fire and it talked. THis was when Moses met g-d.
The first excuse Moses gave god, was that he could not speak as he had a stuttering problem. But god told him that his brother Aaron would do the talking for him.
As it was burning without the bush burning Moses came to look at it and God spoke to him.
Great question! Moses perhaps? The first books of the bible are guessed to be written down by Moses.