Verses with the word preach in the Old Testament (3 verses):

Nehemiah 6:7
And thou hast also appointed prophets to preach of thee at Jerusalem, saying, There is a king in Judah: and now shall it be reported to the king according to these words. Come now therefore, and let us take counsel together.

Isaiah 61:1
The Spirit of the Lord GOD is upon me; because the LORD hath anointed me to preach good tidings unto the meek; he hath sent me to bind up the brokenhearted, to proclaim liberty to the captives, and the opening of the prison to them that are bound;

Jonah 3:2
Arise, go unto Nineveh, that great city, and preach unto it the preaching that I bid thee.