First Reading for The Common of Martyrs - Daily Catholic Mass Reading

The princes of Judah forsook the temple of the LORD, the God of their fathers, and began to serve the sacred poles and the idols; and because of this crime of theirs, wrath came upon Judah and Jerusalem.

Although prophets were sent to them to convert them to the LORD, the people would not listen to their warnings.

Then the spirit of God possessed Zechariah, son of Jehoiada the priest. He took his stand above the people and said to them: "God says, 'Why are you transgressing the Lord's commands, so that you cannot prosper? Because you have abandoned the LORD, he has abandoned you."'

But the people conspired against him, and at the king's order they stoned him to death in the court of the LORD'S temple. Thus King Joash was unmindful of the devotion shown him by Jehoiada, Zechariah's father, and slew his son. And as he was dying, he said, "May the LORD see and avenge."