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

Job 32:6
And Elihu the son of Barachel the Buzite answered and said, I am young, and ye are very old; wherefore I was afraid, and durst not shew you mine opinion.

Job 32:10
Therefore I said, Hearken to me; I also will shew mine opinion.

Job 32:17
I said, I will answer also my part, I also will shew mine opinion.