לֵאמֹ֗ר אֶל־הַכֹּֽהֲנִים֙ אֲשֶׁר֙ לְבֵית־יְהוָ֣ה צְבָא֔וֹת וְאֶל־הַנְּבִיאִ֖ים לֵאמֹ֑ר הַֽאֶבְכֶּה֙ בַּחֹ֣דֶשׁ הַחֲמִשִׁ֔י הִנָּזֵ֕ר כַּאֲשֶׁ֣ר עָשִׂ֔יתִי זֶ֖ה כַּמֶּ֥ה שָׁנִֽים׃ (פ)
and to speak unto the priests of the house of the LORD of hosts, and to the prophets, saying: ‘Should I weep in the fifth month, separating myself, as I have done these so many years?’
Rashi on Zechariah
abstaining To abstain from pleasure, as I have done these seventy years. The word נְזִירָה always means separation.
Radak on Zechariah
To say to the house of the LORD — meaning, "in the house of the LORD." And Targum Jonathan translates as "who were serving in the Holy Temple of the LORD."
Radak on Zechariah
And to the prophets — Haggai, Zechariah, and Malachi. And Targum Jonathan translates as "and to the scribes."