Now it came to pass in the thirtieth year, in the fourth month, in the fifth day of the month, as I was among the captives by the river of Chebar, that the heavens were opened, and I saw visions of God. In the thirtieth year - We know not what this date refers to. Some think it was the age of the prophet; others think the date is taken from the time that Josiah renewed the covenant with the people, 2 Kings 22:3, from which Usher, Prideaux, and Calmet compute the forty years of Judah's transgression, mentioned 2 Kings 4:6.
Abp. Newcome thinks there is an error in the text, and that instead of בשלשים bisheloshim, in the thirtieth, we should read בחמישית bachamishith, in the fifth, as in the second verse. "Now it came to pass in the fifth year, in the fourth month, in the fifth day of the month," etc. But this is supported by none of the ancient Versions, nor by any MS. The Chaldee paraphrases the verse, "And it came to pass thirty years after the high priest Hilkiah had found the book of the law, in the house of the sanctuary," etc. This was in the twelfth year of Josiah's reign. The thirtieth year, computed as above, comes to A.M. 3409, the fourth year from the captivity of Jeconiah, and the fifth of the reign of Zedekiah. Ezekiel was then among the captives who had been carried way with Jeconiah, and had his dwelling near the river Chebar, Chaborus, or Aboras, a river of Mesopotamia, which falls into the Euphrates a little above Thapsacus, after having run through Mesopotamia from east to west. - Calmet.
Fourth month - Thammuz, answering nearly to our July.
I saw visions of God - Emblems and symbols of the Divine Majesty. He particularly refers to those in this chapter.