Zechariah 7:3

and to speak unto the priests which were in the house of the Lord of hosts, who were on duty, although the Temple was not yet finished, and to the prophets, also servants of the true God in the more specific sense, saying, Should I weep in the fifth month, observing a special fast in commemoration of the taking of the city of Jerusalem by Nebuchadnezzar, separating myself, abstaining from food, as I have done these so many years? for this fast had become a custom during the captivity, and now that the Jews were once more living in Palestine, was being observed throughout the country. For this reason the question was of practical importance for all the Jews, both at home and abroad.