Commentary for Daniel 12:12

Fortunate is he who waits etc. Forty five years are added to the above number, for our King Messiah is destined to be hidden after he is revealed and to be revealed again. So we find in Midrash Ruth, and so did Rabbi Eleazar HaKalir establish (in the concluding poem of the morning service of the portion dealing with the month of Nissan): “and he will be concealed from them six weeks of years.”