This Bible contradiction is from the Skeptic's Annotated Bible.
2 Chronicles 24:20-21 View context
And the Spirit of God came upon Zechariah the son of Jehoiada the priest, which stood above the people, and said unto them, Thus saith God, Why transgress ye the commandments of the LORD, that ye cannot prosper? because ye have forsaken the LORD, he hath also forsaken you.
And they conspired against him, and stoned him with stones at the commandment of the king in the court of the house of the LORD.
Matthew 23:35 View context
That upon you may come all the righteous blood shed upon the earth, from the blood of righteous Abel unto the blood of Zacharias son of Barachias, whom ye slew between the temple and the altar.