4 "Lie also on your left side, and lay the iniquity of the house of Israel upon it. According to the number of the days that you lie on it, you shall bear their iniquity. 5 For I have laid on you the years of their iniquity, according to the number of the days, three hundred and ninety days; so you shall bear the iniquity of the house of Israel. 6 And when you have completed them, lie again on your right side; then you shall bear the iniquity of the house of Judah forty days. I have laid on you a day for each year.
Matthew Henry's Commentary on Ezekiel 4:4-6
Commentary on Ezekiel 4:1-8
(Read Ezekiel 4:1-8)
The prophet was to represent the siege of Jerusalem by signs. He was to lie on his left side for a number of days, supposed to be equal to the years from the establishment of idolatry. All that the prophet sets before the children of his people, about the destruction of Jerusalem, is to show that sin is the provoking cause of the ruin of that once flourishing city.