Rashi on TanakhZechariah 7

And Sharezer and Regem Melech and his men sent to Bethel They were righteous men, and they sent [word] to their kinsmen in Bethel to come to pray before the Lord in Jerusalem for them, and to ask the priests to let them know if they should [still] weep in the month of Av, since the Temple had been rebuilt.

abstaining To abstain from pleasure, as I have done these seventy years. The word נְזִירָה always means separation.

and in the seventh [month] That is the fast of Gedaliah.

did you fast for Me, even for Me The ‘he’ is vowelized with a ‘hataf pattah’ because it is used as the interrogative: Did you fast in My honor that you should be required to fast now, too?

And when you eat and when you drink And, if you do not fast, that, too, means nothing to Me. Are not the food and the drink for your own pleasure?

Was it not the words Who caused you the fast and the mourning? Was it not the words of reproof that the Lord proclaimed, etc.? They brought about your destruction, and therefore you fasted. And these are the words that He proclaimed: Execute true judgment.

shamir A worm stronger than flint. They would show it to the stone, which would split.

And it came about; as He called and they did not hearken the Lord said concerning them in those days: So shall they call and I will not hearken.

I will scatter them in exile. And so I did.

they made with their iniquity.

desolation And that brought about the fast (and the mourning), but now [I am jealous for Zion, etc.]