26 The verb again is from בִּין (bin, “to perceive; to understand”); in this stem it means to “to pay close attention.”
27 The particle הִנֵּה (hinneh, “behold”) has a deictic force here, calling attention to the thought that is now presented.
28 The participle מוֹכִיחַ (mokhiakh) is from the verb יָכַח (yakhakh) that has been used frequently in the book of Job. It means “to argue; to contend; to debate; to prove; to dispute.” The usage of the verb shows that it can focus on the beginning of an argument, the debating itself, or the resolution of the conflict. Here the latter is obviously meant, for they did argue and contend and criticize—but could not prove Job wrong.
29 Heb “lest you say.” R. Gordis (Job, 368) calls this a breviloquence: “beware lest [you say].” He then suggests the best reading for their quote to be, “We have attained wisdom, but only God can refute him, not man.” H. H. Rowley (Job [], 209) suggests the meaning is a little different, namely, that they are saying they have found wisdom in Job, and only God can deal with it. Elihu is in effect saying that they do not need God, for he is quite capable for this.
30 The root is נָדַף (nadaf, “to drive away; to drive off”). Here it is in the abstract sense of “succeed in doing something; confound,” and so “refute; rebut.” Dhorme wants to change the meaning of the word with a slight emendation in the text, deriving it from אָלַף (’alaf, “instruct”) the form becoming יַלְּפֶנוּ (yalléfenu) instead of יִדְּפֶנּוּ (yiddéfenu), obtaining the translation “God will instruct us.” This makes a smoother reading, but does not have much support for it.

In other versions

ESVEnglish Standard Version

I gave you my attention,

and, behold, there was none among you who refuted Job

or who answered his words.

Beware lest you say, ‘We have found wisdom;

God may vanquish him, not a man.’

NIVNew International Version (2011)

I gave you my full attention.

But not one of you has proved Job wrong;

none of you has answered his arguments.

Do not say, ‘We have found wisdom;

let God, not a man, refute him.’

CSBChristian Standard Bible

I paid close attention to you.

Yet no one proved Job wrong;

not one of you refuted his arguments.

So do not claim, “We have found wisdom;

let God deal with him, not man.”

NLTNew Living Translation

I have listened,

but not one of you has refuted Job

or answered his arguments.

And don’t tell me, ‘He is too wise for us.

Only God can convince him.’

LEBThe Lexham English Bible

And I directed my attention to you;

and, look, there is no one for Job who refuted,

answering his words among you.

So do not say, ‘We have found wisdom;

let God refute him, not a man.’

KJV 1900King James Version

Yea, I attended unto you,

And, behold, there was none of you that convinced Job,

Or that answered his words:

Lest ye should say, We have found out wisdom:

God thrusteth him down, not man.

Public Domain