The Book of Ezekiel was written by Ezekiel the priest during the Babylonian exile and it covers the judgement of God owing to the Jews idolatry, it highlights that God is sovereign, and it points to eventual restoration with a new covenant.
In Ezekiel 1 Ezekiel receives the initial call of God in Babylon by the Kebar River in 593 BC. He had a vision of the glory of God and in the fire he saw 4 living creatures like men and each of them had 4 faces and 4 wings. Their faces were of men, lions, oxen and eagles. Accompanying the creatures were 4 very big wheels whose "rims were high and awesome, and all 4 were full of eyes all around". Above all this the was an "expanse" and above this there was "a throne of Sapphire, and high above on the throne was a figure like that of a man". "This was the appearance of the likeness of the glory of the Lord", and the whole vision would seem to be symbolic of the majesty of God.