Ezekiel 4:6

And when thou hast accomplished them, having fulfilled the three hundred and ninety days typical of the bearing of Israel's burden, lie again on thy right side, and thou shalt bear the iniquity of the house of Judah forty days, a number which may refer to various periods in the history of the people or, as some think, to the last forty years of the Egyptian bondage, which were at the same time the years which gave Moses his test for leadership; I have appointed thee each day for a year, that is, one day of the symbolical act stood for a whole year in the actual history to which it referred.