12 Then the angel of the LORD said, “LORD Almighty, how long will you withhold mercy from Jerusalem and from the towns of Judah, which you have been angry with these seventy years?”

Read Zechariah 1:12 Using Other Translations

Then the angel of the LORD answered and said, O LORD of hosts, how long wilt thou not have mercy on Jerusalem and on the cities of Judah, against which thou hast had indignation these threescore and ten years?
Then the angel of the LORD said, 'O LORD of hosts, how long will you have no mercy on Jerusalem and the cities of Judah, against which you have been angry these seventy years?'
Upon hearing this, the angel of the LORD prayed this prayer: “O LORD of Heaven’s Armies, for seventy years now you have been angry with Jerusalem and the towns of Judah. How long until you again show mercy to them?”