For I have laid upon thee the years of their iniquity, according to the number of the days, three hundred and ninety days: so shalt thou bear the iniquity of the house of Israel.

Wesley's Notes

4:5 I have laid - I have pointed out the number of years wherein apostate Israel sinned against me, and I did bear with them. Years - These years probably began at Solomon's falling to idolatry, in the twenty - seventh year of his reign, and ended in the fifth of Zedekiah's captivity.

Jamieson-Fausset-Brown Bible Commentary

5. three hundred and ninety days-The three hundred ninety years of punishment appointed for Israel, and forty for Judah, cannot refer to the siege of Jerusalem. That siege is referred to in Eze 4:1-3, and in a sense restricted to the literal siege, but comprehending the whole train of punishment to be inflicted for their sin; therefore we read here merely of its sore pressure, not of its result. The sum of three hundred ninety and forty years is four hundred thirty, a period famous in the history of the covenant-people, being that of their sojourn in Egypt (Ex 12:40, 41; Ga 3:17). The forty alludes to the forty years in the wilderness. Elsewhere (De 28:68; Ho 9:3), God threatened to bring them back to Egypt, which must mean, not Egypt literally, but a bondage as bad as that one in Egypt. So now God will reduce them to a kind of new Egyptian bondage to the world: Israel, the greater transgressor, for a longer period than Judah (compare Eze 20:35-38). Not the whole of the four hundred thirty years of the Egypt state is appointed to Israel; but this shortened by the forty years of the wilderness sojourn, to imply, that a way is open to their return to life by their having the Egypt state merged into that of the wilderness; that is, by ceasing from idolatry and seeking in their sifting and sore troubles, through God's covenant, a restoration to righteousness and peace [Fairbairn]. The three hundred ninety, in reference to the sin of Israel, was also literally true, being the years from the setting up of the calves by Jeroboam (1Ki 12:20-33), that is, from 975 to 583 B.C.: about the year of the Babylonians captivity; and perhaps the forty of Judah refers to that part of Manasseh's fifty-five years' reign in which he had not repented, and which, we are expressly told, was the cause of God's removal of Judah, notwithstanding Josiah's reformation (1Ki 21:10-16; 2Ki 23:26, 27).

Matthew Henry's Concise Commentary

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.