'Preacher' in the Bible

The words of the Preacher, the son of David, king in Jerusalem.

Vanity of vanities, saith the Preacher, vanity of vanities! all is vanity.

I, the Preacher, was king over Israel in Jerusalem.

See this which I have found, saith the Preacher, searching one by one to find out the reason;

Vanity of vanities, saith the Preacher: all is vanity.

And moreover, because the Preacher was wise, he still taught the people knowledge; and he pondered, and sought out, and set in order many proverbs.

The Preacher sought to find out acceptable words; and that which was written is upright, words of truth.