Charles Spurgeon Commentary Zechariah 7:2-3

"Now [they of] Beth-el had sent Sharezer and Regem-melech, and their men, to entreat the favor of Jehovah, [and] to speak unto the priests of the house of Jehovah of hosts, and to the prophets, saying, Should I weep in the fifth month, separating myself, as I have done these so many years?" — Zechariah 7:2-3 (ASV)

On that day, the Jews had kept a fast to commemorate the terrible calamity that happened to the temple in the time of Nebuchadnezzar. Now, these people were living far away in Babylon, and it occurred to them that, since the temple was now being rebuilt and Jerusalem was restored, it was a question whether they should keep that fast any longer; it was not kept by divine command. It was a fast of their own invention, and the question was whether they should not abandon it, now that things had changed so much; so they sent messengers to the temple to inquire of the priests and the prophets, and to pray to God Himself. When we have a difficult question lying on the conscience, it is good to settle it, and not allow it to rest on the heart unsatisfied.