Now it came to pass in the thirtieth year, in the fourth month, on the fifth day of the month, as I was among the captives by the River Chebar, that the heavens were opened and I saw visions of God.
References for Ezekiel 1:1
On the fifth day of the month, which was in the fifth year of King Jehoiachin's captivity,
the word of the Lord came expressly to Ezekiel the priest, the son of Buzi, in the land of the Chaldeans by the River Chebar; and the hand of the Lord was upon him there.
References for Ezekiel 1:3