Daniel 10:1-3

In the third year of the reign of King Cyrus of Persia, a message was made plain to Daniel, whose Babylonian name was Belteshazzar. The message was true. It dealt with a big war. He understood the message, the understanding coming by revelation: “During those days, I, Daniel, went into mourning over Jerusalem for three weeks. I ate only plain and simple food, no seasoning or meat or wine. I neither bathed nor shaved until the three weeks were up.