Charles Spurgeon Commentary 2 Chronicles 20:14

"Then upon Jahaziel the son of Zechariah, the son of Benaiah, the son of Jeiel, the son of Mattaniah, the Levite, of the sons of Asaph, came the Spirit of Jehovah in the midst of the assembly;" — 2 Chronicles 20:14 (ASV)

Perhaps he had never delivered a prophecy before. This is his first sermon; but the Spirit of God was with him, and he could not hold his tongue.