Verses with the word secrets in the Old Testament (8 verses):

Deuteronomy 25:11
When men strive together one with another, and the wife of the one draweth near for to deliver her husband out of the hand of him that smiteth him, and putteth forth her hand, and taketh him by the secrets:

Job 11:6
And that he would shew thee the secrets of wisdom, that they are double to that which is! Know therefore that God exacteth of thee less than thine iniquity deserveth.

Psalms 44:21
Shall not God search this out? for he knoweth the secrets of the heart.

Proverbs 11:13
A talebearer revealeth secrets: but he that is of a faithful spirit concealeth the matter.

Proverbs 20:19
He that goeth about as a talebearer revealeth secrets: therefore meddle not with him that flattereth with his lips.

Daniel 2:28
But there is a God in heaven that revealeth secrets, and maketh known to the king Nebuchadnezzar what shall be in the latter days. Thy dream, and the visions of thy head upon thy bed, are these;

Daniel 2:29
As for thee, O king, thy thoughts came into thy mind upon thy bed, what should come to pass hereafter: and he that revealeth secrets maketh known to thee what shall come to pass.

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.