Ezekiel 4:9

The best exposition of this part of Ezekiel's prediction of Jerusalem's desolation is Jeremiah's lamentation of it, Lam 4:3, Lam 4:4, etc., and Lam 4:10, where he pathetically describes the terrible famine that was in Jerusalem during the siege and the sad effects of it. I. The prophet here, to affect the people with the foresight of it, must confine himself for 390 days to coarse fare and short commons, and that ill-dressed, for they should want both food and fuel. 1. His meat, for the quality of it, was to be of the worst bread, made of but little wheat and barley, and the rest of beans, and lentiles, and millet, and fitches, such as we feed horses or fatted hogs with, and this mixed, as mill corn, or as that in the beggar's bag, that has a dish full of one sort of corn at one house and of another at another house; of such corn as this must the prophet's bread be made while he underwent the fatigue of lying on his side, and needed something better to support him, Eze 4:9. Note, It is our wisdom not to be too fond of dainties and pleasant bread, because we know not what hard meat we may be tied to, nay, and may be glad of, before we die.

— Matthew Henry's Concise Commentary (public domain)

wheat . . . barley, &c.--Instead of simple flour used for delicate cakes (Gen 18:6), the Jews should have a coarse mixture of six different kinds of grain, such as the poorest alone would eat. fitches--spelt or dhourra. three hundred and ninety--The forty days are omitted, since these latter typify the wilderness period when Israel stood separate from the Gentiles and their pollution, though partially chastened by stint of bread and water (Eze 4:16), whereas the eating of the polluted bread in the three hundred ninety days implies a forced residence "among the Gentiles" who were polluted with idolatry (Eze 4:13). This last is said of "Israel" primarily, as being the most debased (Eze 4:9-15); they had spiritually sunk to a level with the heathen, therefore God will make their condition outwardly to correspond. Judah and Jerusalem fare less severely, being less guilty: they are to "eat bread by weight and with care," that is, have a stinted supply and be chastened with the milder discipline of the wilderness period. But Judah also is secondarily referred to in the three hundred ninety days, as having fallen, like Israel, into Gentile defilements; if, then, the Jews are to escape from the exile among Gentiles, which is their just punishment, they must submit again to the wilderness probation (Eze 4:16).

— Jamieson-Fausset-Brown Commentary (public domain)