Then the spirit clothed Amasai, who was chief of the thirty, and he said,
“We are yours, David,
and on your side, you son of Jesse:
peace, peace be to you,
and peace be to your helpers,
for your God helps you.”
Then David received them and made them captains of the band. Bible

“and he said,” This is a great example of God putting His gift of holy spirit upon someone who was not generally known as a prophet, who then gave a very powerful word of prophecy to David.

Commentary for: 1 Chronicles 12:18