Daniel 10:18

In the third year of Cyrus king of Persia a thing was revealed unto Daniel, whose name was called Belteshazzar; and the thing was true, but the time appointed was long: and he understood the thing, and had understanding of the vision.

In those days I Daniel was mourning three full weeks.

I ate no pleasant bread, neither came flesh nor wine in my mouth, neither did I anoint myself at all, till three whole weeks were fulfilled.

And in the four and twentieth day of the first month, as I was by the side of the great river, which is Hiddekel;