They were to ask this question of the prophets and the priests at the Temple of the Lord of Heaven’s Armies: “Should we continue to mourn and fast each summer on the anniversary of the Temple’s destruction, as we have done for so many years?”
“Say to all your people and your priests, ‘During these seventy years of exile, when you fasted and mourned in the summer and in early autumn, was it really for me that you were fasting?