Zechariah 7:3

7:3 by asking both the priests of the temple of the Lord who rules over all and the prophets, “Should we weep in the fifth month, fasting as we have done over the years?”

Jeremiah 52:12-15

52:12 On the tenth day of the fifth month, in the nineteenth year of King Nebuchadnezzar of Babylon, Nebuzaradan, the captain of the royal guard who served the king of Babylon, arrived in Jerusalem. 52:13 He burned down the Lord’s temple, the royal palace, and all the houses in Jerusalem, including every large house. 52:14 The whole Babylonian army that came with the captain of the royal guard tore down the walls that surrounded Jerusalem. 52:15 Nebuzaradan, the captain of the royal guard, took into exile some of the poor, the rest of the people who remained in the city, those who had deserted to him, and the rest of the craftsmen.