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

Job 20:27
The heaven shall reveal his iniquity; and the earth shall rise up against him.

Jeremiah 33:6
Behold, I will bring it health and cure, and I will cure them, and will reveal unto them the abundance of peace and truth.

Daniel 2:47
The king answered unto Daniel, and said, Of a truth it is, that your God is a God of gods, and a Lord of kings, and a revealer of secrets, seeing thou couldest reveal this secret.