Albert Barnes Commentary Job 34:3

"For the ear trieth words, As the palate tasteth food." — Job 34:3 (ASV)

For the ear tries words - Ascertains their meaning, and especially determines what words are worth regarding. The object of this is to fix the attention on what he was about to say; to get the ear so that every word should make its proper impression. The word “ear” in this place, however, seems not to be used to denote the external organ, but the whole faculty of hearing. It is by hearing that the meaning of what is said is determined, as it is by the taste that the quality of food is discerned.

As the mouth tastes meat - Margin, as in Hebrew, “palate.” The meaning is, as the organ of taste determines the nature of the various articles of food. The same figure is used by Job in (Job 12:11).