Ezekiel 4:6-8

6And when you have completed them, lie again on your right side; then you shall bear the iniquity of the house of Judah forty days. I have laid on you a day for each year.

7“Therefore you shall set your face toward the siege of Jerusalem; your arm shall be uncovered, and you shall prophesy against it.

8And surely I will restrain you so that you cannot turn from one side to another till you have ended the days of your siege.